feat(tasarim): görsel dilin tek kaynağı DESIGN.md, proje skill'i ve tasarım denetim betiği
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- docs/tasarim/DESIGN.md: 9 bölümlük görsel dil belgesi (renk rolleri, tipografi,
  tek kaynak bileşenlerin sınıf dizileri, yerleşim, yap/yapma, brief şablonu)
- kolaytercih-tasarim skill'i: UI işinde tetiklenir, belgeye götürür, örnek verir;
  tasarimci ve yazilimci ajanlarına skills: ile önyüklenir
- scripts/tasarim-denetim.ts: 13 kural (Badge, CTA'da Sparkles, palet dışı ton,
  gradyan metin, parlama, hareket spam'i, çarpı, font); pnpm lint'e bağlandı
- ui-ux-pro-max genel kataloğu skills'ten .agents/skills-devre-disi/ altına taşındı
- AGENTS.md: DESIGN.md kuralı; rozet sınıfı koda göre düzeltildi (font-bricolage yoktu)
- arama-funnel-karti: palet dışı text-cyan-300 → text-orange-500

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
bilalgursen
2026-09-23 14:44:35 +03:00
parent a42a1a9920
commit dc7861737b
29 changed files with 506 additions and 13 deletions

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No,Category,Guideline,Description,Do,Don't,Code Good,Code Bad,Severity,Docs URL
1,Animation,Use Tailwind animate utilities,Built-in animations are optimized and respect reduced-motion,Use animate-pulse animate-spin animate-ping,Custom @keyframes for simple effects,animate-pulse,@keyframes pulse {...},Medium,https://tailwindcss.com/docs/animation
2,Animation,Limit bounce animations,Continuous bounce is distracting and causes motion sickness,Use animate-bounce sparingly on CTAs only,Multiple bounce animations on page,Single CTA with animate-bounce,5+ elements with animate-bounce,High,
3,Animation,Transition duration,Use appropriate transition speeds for UI feedback,duration-150 to duration-300 for UI,duration-1000 or longer for UI elements,transition-all duration-200,transition-all duration-1000,Medium,https://tailwindcss.com/docs/transition-duration
4,Animation,Hover transitions,Add smooth transitions on hover state changes,Add transition class with hover states,Instant hover changes without transition,hover:bg-gray-100 transition-colors,hover:bg-gray-100 (no transition),Low,
5,Z-Index,Use Tailwind z-* scale,Consistent stacking context with predefined scale,z-0 z-10 z-20 z-30 z-40 z-50,Arbitrary z-index values,z-50 for modals,z-[9999],Medium,https://tailwindcss.com/docs/z-index
6,Z-Index,Fixed elements z-index,Fixed navigation and modals need explicit z-index,z-50 for nav z-40 for dropdowns,Relying on DOM order for stacking,fixed top-0 z-50,fixed top-0 (no z-index),High,
7,Z-Index,Negative z-index for backgrounds,Use negative z-index for decorative backgrounds,z-[-1] for background elements,Positive z-index for backgrounds,-z-10 for decorative,z-10 for background,Low,
8,Layout,Container max-width,Limit content width for readability,max-w-7xl mx-auto for main content,Full-width content on large screens,max-w-7xl mx-auto px-4,w-full (no max-width),Medium,https://tailwindcss.com/docs/container
9,Layout,Responsive padding,Adjust padding for different screen sizes,px-4 md:px-6 lg:px-8,Same padding all sizes,px-4 sm:px-6 lg:px-8,px-8 (same all sizes),Medium,
10,Layout,Grid gaps,Use consistent gap utilities for spacing,gap-4 gap-6 gap-8,Margins on individual items,grid gap-6,grid with mb-4 on each item,Medium,https://tailwindcss.com/docs/gap
11,Layout,Flexbox alignment,Use flex utilities for alignment,items-center justify-between,Multiple nested wrappers,flex items-center justify-between,Nested divs for alignment,Low,
12,Images,Aspect ratio,Maintain consistent image aspect ratios,aspect-video aspect-square,No aspect ratio on containers,aspect-video rounded-lg,No aspect control,Medium,https://tailwindcss.com/docs/aspect-ratio
13,Images,Object fit,Control image scaling within containers,object-cover object-contain,Stretched distorted images,object-cover w-full h-full,No object-fit,Medium,https://tailwindcss.com/docs/object-fit
14,Images,Lazy loading,Defer loading of off-screen images,loading='lazy' on images,All images eager load,<img loading='lazy'>,<img> without lazy,High,
15,Images,Responsive images,Serve appropriate image sizes,srcset and sizes attributes,Same large image all devices,srcset with multiple sizes,4000px image everywhere,High,
16,Typography,Prose plugin,Use @tailwindcss/typography for rich text,prose prose-lg for article content,Custom styles for markdown,prose prose-lg max-w-none,Custom text styling,Medium,https://tailwindcss.com/docs/typography-plugin
17,Typography,Line height,Use appropriate line height for readability,leading-relaxed for body text,Default tight line height,leading-relaxed (1.625),leading-none or leading-tight,Medium,https://tailwindcss.com/docs/line-height
18,Typography,Font size scale,Use consistent text size scale,text-sm text-base text-lg text-xl,Arbitrary font sizes,text-lg,text-[17px],Low,https://tailwindcss.com/docs/font-size
19,Typography,Text truncation,Handle long text gracefully,truncate or line-clamp-*,Overflow breaking layout,line-clamp-2,No overflow handling,Medium,https://tailwindcss.com/docs/text-overflow
20,Colors,Opacity utilities,Use color opacity utilities,bg-black/50 text-white/80,Separate opacity class,bg-black/50,bg-black opacity-50,Low,https://tailwindcss.com/docs/background-color
21,Colors,Dark mode,Support dark mode with dark: prefix,dark:bg-gray-900 dark:text-white,No dark mode support,dark:bg-gray-900,Only light theme,Medium,https://tailwindcss.com/docs/dark-mode
22,Colors,Semantic colors,Use semantic color naming in config,primary secondary danger success,Generic color names in components,bg-primary,bg-blue-500 everywhere,Medium,
23,Spacing,Consistent spacing scale,Use Tailwind spacing scale consistently,p-4 m-6 gap-8,Arbitrary pixel values,p-4 (1rem),p-[15px],Low,https://tailwindcss.com/docs/customizing-spacing
24,Spacing,Negative margins,Use sparingly for overlapping effects,-mt-4 for overlapping elements,Negative margins for layout fixing,-mt-8 for card overlap,-m-2 to fix spacing issues,Medium,
25,Spacing,Space between,Use space-y-* for vertical lists,space-y-4 on flex/grid column,Margin on each child,space-y-4,Each child has mb-4,Low,https://tailwindcss.com/docs/space
26,Forms,Focus states,Always show focus indicators,focus:ring-2 focus:ring-blue-500,Remove focus outline,focus:ring-2 focus:ring-offset-2,focus:outline-none (no replacement),High,
27,Forms,Input sizing,Consistent input dimensions,h-10 px-3 for inputs,Inconsistent input heights,h-10 w-full px-3,Various heights per input,Medium,
28,Forms,Disabled states,Clear disabled styling,disabled:opacity-50 disabled:cursor-not-allowed,No disabled indication,disabled:opacity-50,Same style as enabled,Medium,
29,Forms,Placeholder styling,Style placeholder text appropriately,placeholder:text-gray-400,Dark placeholder text,placeholder:text-gray-400,Default dark placeholder,Low,
30,Responsive,Mobile-first approach,Start with mobile styles and add breakpoints,Default mobile + md: lg: xl:,Desktop-first approach,text-sm md:text-base,text-base max-md:text-sm,Medium,https://tailwindcss.com/docs/responsive-design
31,Responsive,Breakpoint testing,Test at standard breakpoints,320 375 768 1024 1280 1536,Only test on development device,Test all breakpoints,Single device testing,High,
32,Responsive,Hidden/shown utilities,Control visibility per breakpoint,hidden md:block,Different content per breakpoint,hidden md:flex,Separate mobile/desktop components,Low,https://tailwindcss.com/docs/display
33,Buttons,Button sizing,Consistent button dimensions,px-4 py-2 or px-6 py-3,Inconsistent button sizes,px-4 py-2 text-sm,Various padding per button,Medium,
34,Buttons,Touch targets,Minimum 44px touch target on mobile,min-h-[44px] on mobile,Small buttons on mobile,min-h-[44px] min-w-[44px],h-8 w-8 on mobile,High,
35,Buttons,Loading states,Show loading feedback,disabled + spinner icon,Clickable during loading,<Button disabled><Spinner/></Button>,Button without loading state,High,
36,Buttons,Icon buttons,Accessible icon-only buttons,aria-label on icon buttons,Icon button without label,<button aria-label='Close'><XIcon/></button>,<button><XIcon/></button>,High,
37,Cards,Card structure,Consistent card styling,rounded-lg shadow-md p-6,Inconsistent card styles,rounded-2xl shadow-lg p-6,Mixed card styling,Low,
38,Cards,Card hover states,Interactive cards should have hover feedback,hover:shadow-lg transition-shadow,No hover on clickable cards,hover:shadow-xl transition-shadow,Static cards that are clickable,Medium,
39,Cards,Card spacing,Consistent internal card spacing,space-y-4 for card content,Inconsistent internal spacing,space-y-4 or p-6,Mixed mb-2 mb-4 mb-6,Low,
40,Accessibility,Screen reader text,Provide context for screen readers,sr-only for hidden labels,Missing context for icons,<span class='sr-only'>Close menu</span>,No label for icon button,High,https://tailwindcss.com/docs/screen-readers
41,Accessibility,Focus visible,Show focus only for keyboard users,focus-visible:ring-2,Focus on all interactions,focus-visible:ring-2,focus:ring-2 (shows on click too),Medium,
42,Accessibility,Reduced motion,Respect user motion preferences,motion-reduce:animate-none,Ignore motion preferences,motion-reduce:transition-none,No reduced motion support,High,https://tailwindcss.com/docs/hover-focus-and-other-states#prefers-reduced-motion
43,Performance,Configure content paths,Tailwind needs to know where classes are used,Use 'content' array in config,Use deprecated 'purge' option (v2),"content: ['./src/**/*.{js,ts,jsx,tsx}']",purge: [...],High,https://tailwindcss.com/docs/content-configuration
44,Performance,JIT mode,Use JIT for faster builds and smaller bundles,JIT enabled (default in v3),Full CSS in development,Tailwind v3 defaults,Tailwind v2 without JIT,Medium,
45,Performance,Avoid @apply bloat,Use @apply sparingly,Direct utilities in HTML,Heavy @apply usage,class='px-4 py-2 rounded',@apply px-4 py-2 rounded;,Low,https://tailwindcss.com/docs/reusing-styles
46,Plugins,Official plugins,Use official Tailwind plugins,@tailwindcss/forms typography aspect-ratio,Custom implementations,@tailwindcss/forms,Custom form reset CSS,Medium,https://tailwindcss.com/docs/plugins
47,Plugins,Custom utilities,Create utilities for repeated patterns,Custom utility in config,Repeated arbitrary values,Custom shadow utility,"shadow-[0_4px_20px_rgba(0,0,0,0.1)] everywhere",Medium,
48,Layout,Container Queries,Use @container for component-based responsiveness,Use @container and @lg: etc.,Media queries for component internals,@container @lg:grid-cols-2,@media (min-width: ...) inside component,Medium,https://github.com/tailwindlabs/tailwindcss-container-queries
49,Interactivity,Group and Peer,Style based on parent/sibling state,group-hover peer-checked,JS for simple state interactions,group-hover:text-blue-500,onMouseEnter={() => setHover(true)},Low,https://tailwindcss.com/docs/hover-focus-and-other-states#styling-based-on-parent-state
50,Customization,Arbitrary Values,Use [] for one-off values,w-[350px] for specific needs,Creating config for single use,top-[117px] (if strictly needed),style={{ top: '117px' }},Low,https://tailwindcss.com/docs/adding-custom-styles#using-arbitrary-values
51,Colors,Theme color variables,Define colors in Tailwind theme and use directly,bg-primary text-success border-cta,bg-[var(--color-primary)] text-[var(--color-success)],bg-primary,bg-[var(--color-primary)],Medium,https://tailwindcss.com/docs/customizing-colors
52,Colors,Use bg-linear-to-* for gradients,Tailwind v4 uses bg-linear-to-* syntax for gradients,bg-linear-to-r bg-linear-to-b,bg-gradient-to-* (deprecated in v4),bg-linear-to-r from-blue-500 to-purple-500,bg-gradient-to-r from-blue-500 to-purple-500,Medium,https://tailwindcss.com/docs/background-image
53,Layout,Use shrink-0 shorthand,Shorter class name for flex-shrink-0,shrink-0 shrink,flex-shrink-0 flex-shrink,shrink-0,flex-shrink-0,Low,https://tailwindcss.com/docs/flex-shrink
54,Layout,Use size-* for square dimensions,Single utility for equal width and height,size-4 size-8 size-12,Separate h-* w-* for squares,size-6,h-6 w-6,Low,https://tailwindcss.com/docs/size
55,Images,SVG explicit dimensions,Add width/height attributes to SVGs to prevent layout shift before CSS loads,<svg class='size-6' width='24' height='24'>,SVG without explicit dimensions,<svg class='size-6' width='24' height='24'>,<svg class='size-6'>,High,
1 No Category Guideline Description Do Don't Code Good Code Bad Severity Docs URL
2 1 Animation Use Tailwind animate utilities Built-in animations are optimized and respect reduced-motion Use animate-pulse animate-spin animate-ping Custom @keyframes for simple effects animate-pulse @keyframes pulse {...} Medium https://tailwindcss.com/docs/animation
3 2 Animation Limit bounce animations Continuous bounce is distracting and causes motion sickness Use animate-bounce sparingly on CTAs only Multiple bounce animations on page Single CTA with animate-bounce 5+ elements with animate-bounce High
4 3 Animation Transition duration Use appropriate transition speeds for UI feedback duration-150 to duration-300 for UI duration-1000 or longer for UI elements transition-all duration-200 transition-all duration-1000 Medium https://tailwindcss.com/docs/transition-duration
5 4 Animation Hover transitions Add smooth transitions on hover state changes Add transition class with hover states Instant hover changes without transition hover:bg-gray-100 transition-colors hover:bg-gray-100 (no transition) Low
6 5 Z-Index Use Tailwind z-* scale Consistent stacking context with predefined scale z-0 z-10 z-20 z-30 z-40 z-50 Arbitrary z-index values z-50 for modals z-[9999] Medium https://tailwindcss.com/docs/z-index
7 6 Z-Index Fixed elements z-index Fixed navigation and modals need explicit z-index z-50 for nav z-40 for dropdowns Relying on DOM order for stacking fixed top-0 z-50 fixed top-0 (no z-index) High
8 7 Z-Index Negative z-index for backgrounds Use negative z-index for decorative backgrounds z-[-1] for background elements Positive z-index for backgrounds -z-10 for decorative z-10 for background Low
9 8 Layout Container max-width Limit content width for readability max-w-7xl mx-auto for main content Full-width content on large screens max-w-7xl mx-auto px-4 w-full (no max-width) Medium https://tailwindcss.com/docs/container
10 9 Layout Responsive padding Adjust padding for different screen sizes px-4 md:px-6 lg:px-8 Same padding all sizes px-4 sm:px-6 lg:px-8 px-8 (same all sizes) Medium
11 10 Layout Grid gaps Use consistent gap utilities for spacing gap-4 gap-6 gap-8 Margins on individual items grid gap-6 grid with mb-4 on each item Medium https://tailwindcss.com/docs/gap
12 11 Layout Flexbox alignment Use flex utilities for alignment items-center justify-between Multiple nested wrappers flex items-center justify-between Nested divs for alignment Low
13 12 Images Aspect ratio Maintain consistent image aspect ratios aspect-video aspect-square No aspect ratio on containers aspect-video rounded-lg No aspect control Medium https://tailwindcss.com/docs/aspect-ratio
14 13 Images Object fit Control image scaling within containers object-cover object-contain Stretched distorted images object-cover w-full h-full No object-fit Medium https://tailwindcss.com/docs/object-fit
15 14 Images Lazy loading Defer loading of off-screen images loading='lazy' on images All images eager load <img loading='lazy'> <img> without lazy High
16 15 Images Responsive images Serve appropriate image sizes srcset and sizes attributes Same large image all devices srcset with multiple sizes 4000px image everywhere High
17 16 Typography Prose plugin Use @tailwindcss/typography for rich text prose prose-lg for article content Custom styles for markdown prose prose-lg max-w-none Custom text styling Medium https://tailwindcss.com/docs/typography-plugin
18 17 Typography Line height Use appropriate line height for readability leading-relaxed for body text Default tight line height leading-relaxed (1.625) leading-none or leading-tight Medium https://tailwindcss.com/docs/line-height
19 18 Typography Font size scale Use consistent text size scale text-sm text-base text-lg text-xl Arbitrary font sizes text-lg text-[17px] Low https://tailwindcss.com/docs/font-size
20 19 Typography Text truncation Handle long text gracefully truncate or line-clamp-* Overflow breaking layout line-clamp-2 No overflow handling Medium https://tailwindcss.com/docs/text-overflow
21 20 Colors Opacity utilities Use color opacity utilities bg-black/50 text-white/80 Separate opacity class bg-black/50 bg-black opacity-50 Low https://tailwindcss.com/docs/background-color
22 21 Colors Dark mode Support dark mode with dark: prefix dark:bg-gray-900 dark:text-white No dark mode support dark:bg-gray-900 Only light theme Medium https://tailwindcss.com/docs/dark-mode
23 22 Colors Semantic colors Use semantic color naming in config primary secondary danger success Generic color names in components bg-primary bg-blue-500 everywhere Medium
24 23 Spacing Consistent spacing scale Use Tailwind spacing scale consistently p-4 m-6 gap-8 Arbitrary pixel values p-4 (1rem) p-[15px] Low https://tailwindcss.com/docs/customizing-spacing
25 24 Spacing Negative margins Use sparingly for overlapping effects -mt-4 for overlapping elements Negative margins for layout fixing -mt-8 for card overlap -m-2 to fix spacing issues Medium
26 25 Spacing Space between Use space-y-* for vertical lists space-y-4 on flex/grid column Margin on each child space-y-4 Each child has mb-4 Low https://tailwindcss.com/docs/space
27 26 Forms Focus states Always show focus indicators focus:ring-2 focus:ring-blue-500 Remove focus outline focus:ring-2 focus:ring-offset-2 focus:outline-none (no replacement) High
28 27 Forms Input sizing Consistent input dimensions h-10 px-3 for inputs Inconsistent input heights h-10 w-full px-3 Various heights per input Medium
29 28 Forms Disabled states Clear disabled styling disabled:opacity-50 disabled:cursor-not-allowed No disabled indication disabled:opacity-50 Same style as enabled Medium
30 29 Forms Placeholder styling Style placeholder text appropriately placeholder:text-gray-400 Dark placeholder text placeholder:text-gray-400 Default dark placeholder Low
31 30 Responsive Mobile-first approach Start with mobile styles and add breakpoints Default mobile + md: lg: xl: Desktop-first approach text-sm md:text-base text-base max-md:text-sm Medium https://tailwindcss.com/docs/responsive-design
32 31 Responsive Breakpoint testing Test at standard breakpoints 320 375 768 1024 1280 1536 Only test on development device Test all breakpoints Single device testing High
33 32 Responsive Hidden/shown utilities Control visibility per breakpoint hidden md:block Different content per breakpoint hidden md:flex Separate mobile/desktop components Low https://tailwindcss.com/docs/display
34 33 Buttons Button sizing Consistent button dimensions px-4 py-2 or px-6 py-3 Inconsistent button sizes px-4 py-2 text-sm Various padding per button Medium
35 34 Buttons Touch targets Minimum 44px touch target on mobile min-h-[44px] on mobile Small buttons on mobile min-h-[44px] min-w-[44px] h-8 w-8 on mobile High
36 35 Buttons Loading states Show loading feedback disabled + spinner icon Clickable during loading <Button disabled><Spinner/></Button> Button without loading state High
37 36 Buttons Icon buttons Accessible icon-only buttons aria-label on icon buttons Icon button without label <button aria-label='Close'><XIcon/></button> <button><XIcon/></button> High
38 37 Cards Card structure Consistent card styling rounded-lg shadow-md p-6 Inconsistent card styles rounded-2xl shadow-lg p-6 Mixed card styling Low
39 38 Cards Card hover states Interactive cards should have hover feedback hover:shadow-lg transition-shadow No hover on clickable cards hover:shadow-xl transition-shadow Static cards that are clickable Medium
40 39 Cards Card spacing Consistent internal card spacing space-y-4 for card content Inconsistent internal spacing space-y-4 or p-6 Mixed mb-2 mb-4 mb-6 Low
41 40 Accessibility Screen reader text Provide context for screen readers sr-only for hidden labels Missing context for icons <span class='sr-only'>Close menu</span> No label for icon button High https://tailwindcss.com/docs/screen-readers
42 41 Accessibility Focus visible Show focus only for keyboard users focus-visible:ring-2 Focus on all interactions focus-visible:ring-2 focus:ring-2 (shows on click too) Medium
43 42 Accessibility Reduced motion Respect user motion preferences motion-reduce:animate-none Ignore motion preferences motion-reduce:transition-none No reduced motion support High https://tailwindcss.com/docs/hover-focus-and-other-states#prefers-reduced-motion
44 43 Performance Configure content paths Tailwind needs to know where classes are used Use 'content' array in config Use deprecated 'purge' option (v2) content: ['./src/**/*.{js,ts,jsx,tsx}'] purge: [...] High https://tailwindcss.com/docs/content-configuration
45 44 Performance JIT mode Use JIT for faster builds and smaller bundles JIT enabled (default in v3) Full CSS in development Tailwind v3 defaults Tailwind v2 without JIT Medium
46 45 Performance Avoid @apply bloat Use @apply sparingly Direct utilities in HTML Heavy @apply usage class='px-4 py-2 rounded' @apply px-4 py-2 rounded; Low https://tailwindcss.com/docs/reusing-styles
47 46 Plugins Official plugins Use official Tailwind plugins @tailwindcss/forms typography aspect-ratio Custom implementations @tailwindcss/forms Custom form reset CSS Medium https://tailwindcss.com/docs/plugins
48 47 Plugins Custom utilities Create utilities for repeated patterns Custom utility in config Repeated arbitrary values Custom shadow utility shadow-[0_4px_20px_rgba(0,0,0,0.1)] everywhere Medium
49 48 Layout Container Queries Use @container for component-based responsiveness Use @container and @lg: etc. Media queries for component internals @container @lg:grid-cols-2 @media (min-width: ...) inside component Medium https://github.com/tailwindlabs/tailwindcss-container-queries
50 49 Interactivity Group and Peer Style based on parent/sibling state group-hover peer-checked JS for simple state interactions group-hover:text-blue-500 onMouseEnter={() => setHover(true)} Low https://tailwindcss.com/docs/hover-focus-and-other-states#styling-based-on-parent-state
51 50 Customization Arbitrary Values Use [] for one-off values w-[350px] for specific needs Creating config for single use top-[117px] (if strictly needed) style={{ top: '117px' }} Low https://tailwindcss.com/docs/adding-custom-styles#using-arbitrary-values
52 51 Colors Theme color variables Define colors in Tailwind theme and use directly bg-primary text-success border-cta bg-[var(--color-primary)] text-[var(--color-success)] bg-primary bg-[var(--color-primary)] Medium https://tailwindcss.com/docs/customizing-colors
53 52 Colors Use bg-linear-to-* for gradients Tailwind v4 uses bg-linear-to-* syntax for gradients bg-linear-to-r bg-linear-to-b bg-gradient-to-* (deprecated in v4) bg-linear-to-r from-blue-500 to-purple-500 bg-gradient-to-r from-blue-500 to-purple-500 Medium https://tailwindcss.com/docs/background-image
54 53 Layout Use shrink-0 shorthand Shorter class name for flex-shrink-0 shrink-0 shrink flex-shrink-0 flex-shrink shrink-0 flex-shrink-0 Low https://tailwindcss.com/docs/flex-shrink
55 54 Layout Use size-* for square dimensions Single utility for equal width and height size-4 size-8 size-12 Separate h-* w-* for squares size-6 h-6 w-6 Low https://tailwindcss.com/docs/size
56 55 Images SVG explicit dimensions Add width/height attributes to SVGs to prevent layout shift before CSS loads <svg class='size-6' width='24' height='24'> SVG without explicit dimensions <svg class='size-6' width='24' height='24'> <svg class='size-6'> High

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No,Category,Guideline,Description,Do,Don't,Code Good,Code Bad,Severity,Docs URL
1,Routing,Use App Router for new projects,App Router is the recommended approach in Next.js 14+,app/ directory with page.tsx,pages/ for new projects,app/dashboard/page.tsx,pages/dashboard.tsx,Medium,https://nextjs.org/docs/app
2,Routing,Use file-based routing,Create routes by adding files in app directory,page.tsx for routes layout.tsx for layouts,Manual route configuration,app/blog/[slug]/page.tsx,Custom router setup,Medium,https://nextjs.org/docs/app/building-your-application/routing
3,Routing,Colocate related files,Keep components styles tests with their routes,Component files alongside page.tsx,Separate components folder,app/dashboard/_components/,components/dashboard/,Low,
4,Routing,Use route groups for organization,Group routes without affecting URL,Parentheses for route groups,Nested folders affecting URL,(marketing)/about/page.tsx,marketing/about/page.tsx,Low,https://nextjs.org/docs/app/building-your-application/routing/route-groups
5,Routing,Handle loading states,Use loading.tsx for route loading UI,loading.tsx alongside page.tsx,Manual loading state management,app/dashboard/loading.tsx,useState for loading in page,Medium,https://nextjs.org/docs/app/building-your-application/routing/loading-ui-and-streaming
6,Routing,Handle errors with error.tsx,Catch errors at route level,error.tsx with reset function,try/catch in every component,app/dashboard/error.tsx,try/catch in page component,High,https://nextjs.org/docs/app/building-your-application/routing/error-handling
7,Rendering,Use Server Components by default,Server Components reduce client JS bundle,Keep components server by default,Add 'use client' unnecessarily,export default function Page(),('use client') for static content,High,https://nextjs.org/docs/app/building-your-application/rendering/server-components
8,Rendering,Mark Client Components explicitly,'use client' for interactive components,Add 'use client' only when needed,Server Component with hooks/events,('use client') for onClick useState,No directive with useState,High,https://nextjs.org/docs/app/building-your-application/rendering/client-components
9,Rendering,Push Client Components down,Keep Client Components as leaf nodes,Client wrapper for interactive parts only,Mark page as Client Component,<InteractiveButton/> in Server Page,('use client') on page.tsx,High,
10,Rendering,Use streaming for better UX,Stream content with Suspense boundaries,Suspense for slow data fetches,Wait for all data before render,<Suspense><SlowComponent/></Suspense>,await allData then render,Medium,https://nextjs.org/docs/app/building-your-application/routing/loading-ui-and-streaming
11,Rendering,Choose correct rendering strategy,SSG for static SSR for dynamic ISR for semi-static,generateStaticParams for known paths,SSR for static content,export const revalidate = 3600,fetch without cache config,Medium,
12,DataFetching,Fetch data in Server Components,Fetch directly in async Server Components,async function Page() { const data = await fetch() },useEffect for initial data,const data = await fetch(url),useEffect(() => fetch(url)),High,https://nextjs.org/docs/app/building-your-application/data-fetching
13,DataFetching,Configure caching explicitly (Next.js 15+),Next.js 15 changed defaults to uncached for fetch,Explicitly set cache: 'force-cache' for static data,Assume default is cached (it's not in Next.js 15),fetch(url { cache: 'force-cache' }),fetch(url) // Uncached in v15,High,https://nextjs.org/docs/app/building-your-application/upgrading/version-15
14,DataFetching,Deduplicate fetch requests,React and Next.js dedupe same requests,Same fetch call in multiple components,Manual request deduplication,Multiple components fetch same URL,Custom cache layer,Low,
15,DataFetching,Use Server Actions for mutations,Server Actions for form submissions,action={serverAction} in forms,API route for every mutation,<form action={createPost}>,<form onSubmit={callApiRoute}>,Medium,https://nextjs.org/docs/app/building-your-application/data-fetching/server-actions-and-mutations
16,DataFetching,Revalidate data appropriately,Use revalidatePath/revalidateTag after mutations,Revalidate after Server Action,'use client' with manual refetch,revalidatePath('/posts'),router.refresh() everywhere,Medium,https://nextjs.org/docs/app/building-your-application/caching#revalidating
17,Images,Use next/image for optimization,Automatic image optimization and lazy loading,<Image> component for all images,<img> tags directly,<Image src={} alt={} width={} height={}>,<img src={}/>,High,https://nextjs.org/docs/app/building-your-application/optimizing/images
18,Images,Provide width and height,Prevent layout shift with dimensions,width and height props or fill,Missing dimensions,<Image width={400} height={300}/>,<Image src={url}/>,High,
19,Images,Use fill for responsive images,Fill container with object-fit,fill prop with relative parent,Fixed dimensions for responsive,"<Image fill className=""object-cover""/>",<Image width={window.width}/>,Medium,
20,Images,Configure remote image domains,Whitelist external image sources,remotePatterns in next.config.js,Allow all domains,remotePatterns: [{ hostname: 'cdn.example.com' }],domains: ['*'],High,https://nextjs.org/docs/app/api-reference/components/image#remotepatterns
21,Images,Use priority for LCP images,Mark above-fold images as priority,priority prop on hero images,All images with priority,<Image priority src={hero}/>,<Image priority/> on every image,Medium,
22,Fonts,Use next/font for fonts,Self-hosted fonts with zero layout shift,next/font/google or next/font/local,External font links,import { Inter } from 'next/font/google',"<link href=""fonts.googleapis.com""/>",Medium,https://nextjs.org/docs/app/building-your-application/optimizing/fonts
23,Fonts,Apply font to layout,Set font in root layout for consistency,className on body in layout.tsx,Font in individual pages,<body className={inter.className}>,Each page imports font,Low,
24,Fonts,Use variable fonts,Variable fonts reduce bundle size,Single variable font file,Multiple font weights as files,Inter({ subsets: ['latin'] }),Inter_400 Inter_500 Inter_700,Low,
25,Metadata,Use generateMetadata for dynamic,Generate metadata based on params,export async function generateMetadata(),Hardcoded metadata everywhere,generateMetadata({ params }),export const metadata = {},Medium,https://nextjs.org/docs/app/building-your-application/optimizing/metadata
26,Metadata,Include OpenGraph images,Add OG images for social sharing,opengraph-image.tsx or og property,Missing social preview images,opengraph: { images: ['/og.png'] },No OG configuration,Medium,
27,Metadata,Use metadata API,Export metadata object for static metadata,export const metadata = {},Manual head tags,export const metadata = { title: 'Page' },<head><title>Page</title></head>,Medium,
28,API,Use Route Handlers for APIs,app/api routes for API endpoints,app/api/users/route.ts,pages/api for new projects,export async function GET(request),export default function handler,Medium,https://nextjs.org/docs/app/building-your-application/routing/route-handlers
29,API,Return proper Response objects,Use NextResponse for API responses,NextResponse.json() for JSON,Plain objects or res.json(),return NextResponse.json({ data }),return { data },Medium,
30,API,Handle HTTP methods explicitly,Export named functions for methods,Export GET POST PUT DELETE,Single handler for all methods,export async function POST(),switch(req.method),Low,
31,API,Validate request body,Validate input before processing,Zod or similar for validation,Trust client input,const body = schema.parse(await req.json()),const body = await req.json(),High,
32,Middleware,Use middleware for auth,Protect routes with middleware.ts,middleware.ts at root,Auth check in every page,export function middleware(request),if (!session) redirect in page,Medium,https://nextjs.org/docs/app/building-your-application/routing/middleware
33,Middleware,Match specific paths,Configure middleware matcher,config.matcher for specific routes,Run middleware on all routes,matcher: ['/dashboard/:path*'],No matcher config,Medium,
34,Middleware,Keep middleware edge-compatible,Middleware runs on Edge runtime,Edge-compatible code only,Node.js APIs in middleware,Edge-compatible auth check,fs.readFile in middleware,High,
35,Environment,Use NEXT_PUBLIC prefix,Client-accessible env vars need prefix,NEXT_PUBLIC_ for client vars,Server vars exposed to client,NEXT_PUBLIC_API_URL,API_SECRET in client code,High,https://nextjs.org/docs/app/building-your-application/configuring/environment-variables
36,Environment,Validate env vars,Check required env vars exist,Validate on startup,Undefined env at runtime,if (!process.env.DATABASE_URL) throw,process.env.DATABASE_URL (might be undefined),High,
37,Environment,Use .env.local for secrets,Local env file for development secrets,.env.local gitignored,Secrets in .env committed,.env.local with secrets,.env with DATABASE_PASSWORD,High,
38,Performance,Analyze bundle size,Use @next/bundle-analyzer,Bundle analyzer in dev,Ship large bundles blindly,ANALYZE=true npm run build,No bundle analysis,Medium,https://nextjs.org/docs/app/building-your-application/optimizing/bundle-analyzer
39,Performance,Use dynamic imports,Code split with next/dynamic,dynamic() for heavy components,Import everything statically,const Chart = dynamic(() => import('./Chart')),import Chart from './Chart',Medium,https://nextjs.org/docs/app/building-your-application/optimizing/lazy-loading
40,Performance,Avoid layout shifts,Reserve space for dynamic content,Skeleton loaders aspect ratios,Content popping in,"<Skeleton className=""h-48""/>",No placeholder for async content,High,
41,Performance,Use Partial Prerendering,Combine static and dynamic in one route,Static shell with Suspense holes,Full dynamic or static pages,Static header + dynamic content,Entire page SSR,Low,https://nextjs.org/docs/app/building-your-application/rendering/partial-prerendering
42,Link,Use next/link for navigation,Client-side navigation with prefetching,"<Link href=""""> for internal links",<a> for internal navigation,"<Link href=""/about"">About</Link>","<a href=""/about"">About</a>",High,https://nextjs.org/docs/app/api-reference/components/link
43,Link,Prefetch strategically,Control prefetching behavior,prefetch={false} for low-priority,Prefetch all links,<Link prefetch={false}>,Default prefetch on every link,Low,
44,Link,Use scroll option appropriately,Control scroll behavior on navigation,scroll={false} for tabs pagination,Always scroll to top,<Link scroll={false}>,Manual scroll management,Low,
45,Config,Use next.config.js correctly,Configure Next.js behavior,Proper config options,Deprecated or wrong options,images: { remotePatterns: [] },images: { domains: [] },Medium,https://nextjs.org/docs/app/api-reference/next-config-js
46,Config,Enable strict mode,Catch potential issues early,reactStrictMode: true,Strict mode disabled,reactStrictMode: true,reactStrictMode: false,Medium,
47,Config,Configure redirects and rewrites,Use config for URL management,redirects() rewrites() in config,Manual redirect handling,redirects: async () => [...],res.redirect in pages,Medium,https://nextjs.org/docs/app/api-reference/next-config-js/redirects
48,Deployment,Use Vercel for easiest deploy,Vercel optimized for Next.js,Deploy to Vercel,Self-host without knowledge,vercel deploy,Complex Docker setup for simple app,Low,https://nextjs.org/docs/app/building-your-application/deploying
49,Deployment,Configure output for self-hosting,Set output option for deployment target,output: 'standalone' for Docker,Default output for containers,output: 'standalone',No output config for Docker,Medium,https://nextjs.org/docs/app/building-your-application/deploying#self-hosting
50,Security,Sanitize user input,Never trust user input,Escape sanitize validate all input,Direct interpolation of user data,DOMPurify.sanitize(userInput),dangerouslySetInnerHTML={{ __html: userInput }},High,
51,Security,Use CSP headers,Content Security Policy for XSS protection,Configure CSP in next.config.js,No security headers,headers() with CSP,No CSP configuration,High,https://nextjs.org/docs/app/building-your-application/configuring/content-security-policy
52,Security,Validate Server Action input,Server Actions are public endpoints,Validate and authorize in Server Action,Trust Server Action input,Auth check + validation in action,Direct database call without check,High,
1 No Category Guideline Description Do Don't Code Good Code Bad Severity Docs URL
2 1 Routing Use App Router for new projects App Router is the recommended approach in Next.js 14+ app/ directory with page.tsx pages/ for new projects app/dashboard/page.tsx pages/dashboard.tsx Medium https://nextjs.org/docs/app
3 2 Routing Use file-based routing Create routes by adding files in app directory page.tsx for routes layout.tsx for layouts Manual route configuration app/blog/[slug]/page.tsx Custom router setup Medium https://nextjs.org/docs/app/building-your-application/routing
4 3 Routing Colocate related files Keep components styles tests with their routes Component files alongside page.tsx Separate components folder app/dashboard/_components/ components/dashboard/ Low
5 4 Routing Use route groups for organization Group routes without affecting URL Parentheses for route groups Nested folders affecting URL (marketing)/about/page.tsx marketing/about/page.tsx Low https://nextjs.org/docs/app/building-your-application/routing/route-groups
6 5 Routing Handle loading states Use loading.tsx for route loading UI loading.tsx alongside page.tsx Manual loading state management app/dashboard/loading.tsx useState for loading in page Medium https://nextjs.org/docs/app/building-your-application/routing/loading-ui-and-streaming
7 6 Routing Handle errors with error.tsx Catch errors at route level error.tsx with reset function try/catch in every component app/dashboard/error.tsx try/catch in page component High https://nextjs.org/docs/app/building-your-application/routing/error-handling
8 7 Rendering Use Server Components by default Server Components reduce client JS bundle Keep components server by default Add 'use client' unnecessarily export default function Page() ('use client') for static content High https://nextjs.org/docs/app/building-your-application/rendering/server-components
9 8 Rendering Mark Client Components explicitly 'use client' for interactive components Add 'use client' only when needed Server Component with hooks/events ('use client') for onClick useState No directive with useState High https://nextjs.org/docs/app/building-your-application/rendering/client-components
10 9 Rendering Push Client Components down Keep Client Components as leaf nodes Client wrapper for interactive parts only Mark page as Client Component <InteractiveButton/> in Server Page ('use client') on page.tsx High
11 10 Rendering Use streaming for better UX Stream content with Suspense boundaries Suspense for slow data fetches Wait for all data before render <Suspense><SlowComponent/></Suspense> await allData then render Medium https://nextjs.org/docs/app/building-your-application/routing/loading-ui-and-streaming
12 11 Rendering Choose correct rendering strategy SSG for static SSR for dynamic ISR for semi-static generateStaticParams for known paths SSR for static content export const revalidate = 3600 fetch without cache config Medium
13 12 DataFetching Fetch data in Server Components Fetch directly in async Server Components async function Page() { const data = await fetch() } useEffect for initial data const data = await fetch(url) useEffect(() => fetch(url)) High https://nextjs.org/docs/app/building-your-application/data-fetching
14 13 DataFetching Configure caching explicitly (Next.js 15+) Next.js 15 changed defaults to uncached for fetch Explicitly set cache: 'force-cache' for static data Assume default is cached (it's not in Next.js 15) fetch(url { cache: 'force-cache' }) fetch(url) // Uncached in v15 High https://nextjs.org/docs/app/building-your-application/upgrading/version-15
15 14 DataFetching Deduplicate fetch requests React and Next.js dedupe same requests Same fetch call in multiple components Manual request deduplication Multiple components fetch same URL Custom cache layer Low
16 15 DataFetching Use Server Actions for mutations Server Actions for form submissions action={serverAction} in forms API route for every mutation <form action={createPost}> <form onSubmit={callApiRoute}> Medium https://nextjs.org/docs/app/building-your-application/data-fetching/server-actions-and-mutations
17 16 DataFetching Revalidate data appropriately Use revalidatePath/revalidateTag after mutations Revalidate after Server Action 'use client' with manual refetch revalidatePath('/posts') router.refresh() everywhere Medium https://nextjs.org/docs/app/building-your-application/caching#revalidating
18 17 Images Use next/image for optimization Automatic image optimization and lazy loading <Image> component for all images <img> tags directly <Image src={} alt={} width={} height={}> <img src={}/> High https://nextjs.org/docs/app/building-your-application/optimizing/images
19 18 Images Provide width and height Prevent layout shift with dimensions width and height props or fill Missing dimensions <Image width={400} height={300}/> <Image src={url}/> High
20 19 Images Use fill for responsive images Fill container with object-fit fill prop with relative parent Fixed dimensions for responsive <Image fill className="object-cover"/> <Image width={window.width}/> Medium
21 20 Images Configure remote image domains Whitelist external image sources remotePatterns in next.config.js Allow all domains remotePatterns: [{ hostname: 'cdn.example.com' }] domains: ['*'] High https://nextjs.org/docs/app/api-reference/components/image#remotepatterns
22 21 Images Use priority for LCP images Mark above-fold images as priority priority prop on hero images All images with priority <Image priority src={hero}/> <Image priority/> on every image Medium
23 22 Fonts Use next/font for fonts Self-hosted fonts with zero layout shift next/font/google or next/font/local External font links import { Inter } from 'next/font/google' <link href="fonts.googleapis.com"/> Medium https://nextjs.org/docs/app/building-your-application/optimizing/fonts
24 23 Fonts Apply font to layout Set font in root layout for consistency className on body in layout.tsx Font in individual pages <body className={inter.className}> Each page imports font Low
25 24 Fonts Use variable fonts Variable fonts reduce bundle size Single variable font file Multiple font weights as files Inter({ subsets: ['latin'] }) Inter_400 Inter_500 Inter_700 Low
26 25 Metadata Use generateMetadata for dynamic Generate metadata based on params export async function generateMetadata() Hardcoded metadata everywhere generateMetadata({ params }) export const metadata = {} Medium https://nextjs.org/docs/app/building-your-application/optimizing/metadata
27 26 Metadata Include OpenGraph images Add OG images for social sharing opengraph-image.tsx or og property Missing social preview images opengraph: { images: ['/og.png'] } No OG configuration Medium
28 27 Metadata Use metadata API Export metadata object for static metadata export const metadata = {} Manual head tags export const metadata = { title: 'Page' } <head><title>Page</title></head> Medium
29 28 API Use Route Handlers for APIs app/api routes for API endpoints app/api/users/route.ts pages/api for new projects export async function GET(request) export default function handler Medium https://nextjs.org/docs/app/building-your-application/routing/route-handlers
30 29 API Return proper Response objects Use NextResponse for API responses NextResponse.json() for JSON Plain objects or res.json() return NextResponse.json({ data }) return { data } Medium
31 30 API Handle HTTP methods explicitly Export named functions for methods Export GET POST PUT DELETE Single handler for all methods export async function POST() switch(req.method) Low
32 31 API Validate request body Validate input before processing Zod or similar for validation Trust client input const body = schema.parse(await req.json()) const body = await req.json() High
33 32 Middleware Use middleware for auth Protect routes with middleware.ts middleware.ts at root Auth check in every page export function middleware(request) if (!session) redirect in page Medium https://nextjs.org/docs/app/building-your-application/routing/middleware
34 33 Middleware Match specific paths Configure middleware matcher config.matcher for specific routes Run middleware on all routes matcher: ['/dashboard/:path*'] No matcher config Medium
35 34 Middleware Keep middleware edge-compatible Middleware runs on Edge runtime Edge-compatible code only Node.js APIs in middleware Edge-compatible auth check fs.readFile in middleware High
36 35 Environment Use NEXT_PUBLIC prefix Client-accessible env vars need prefix NEXT_PUBLIC_ for client vars Server vars exposed to client NEXT_PUBLIC_API_URL API_SECRET in client code High https://nextjs.org/docs/app/building-your-application/configuring/environment-variables
37 36 Environment Validate env vars Check required env vars exist Validate on startup Undefined env at runtime if (!process.env.DATABASE_URL) throw process.env.DATABASE_URL (might be undefined) High
38 37 Environment Use .env.local for secrets Local env file for development secrets .env.local gitignored Secrets in .env committed .env.local with secrets .env with DATABASE_PASSWORD High
39 38 Performance Analyze bundle size Use @next/bundle-analyzer Bundle analyzer in dev Ship large bundles blindly ANALYZE=true npm run build No bundle analysis Medium https://nextjs.org/docs/app/building-your-application/optimizing/bundle-analyzer
40 39 Performance Use dynamic imports Code split with next/dynamic dynamic() for heavy components Import everything statically const Chart = dynamic(() => import('./Chart')) import Chart from './Chart' Medium https://nextjs.org/docs/app/building-your-application/optimizing/lazy-loading
41 40 Performance Avoid layout shifts Reserve space for dynamic content Skeleton loaders aspect ratios Content popping in <Skeleton className="h-48"/> No placeholder for async content High
42 41 Performance Use Partial Prerendering Combine static and dynamic in one route Static shell with Suspense holes Full dynamic or static pages Static header + dynamic content Entire page SSR Low https://nextjs.org/docs/app/building-your-application/rendering/partial-prerendering
43 42 Link Use next/link for navigation Client-side navigation with prefetching <Link href=""> for internal links <a> for internal navigation <Link href="/about">About</Link> <a href="/about">About</a> High https://nextjs.org/docs/app/api-reference/components/link
44 43 Link Prefetch strategically Control prefetching behavior prefetch={false} for low-priority Prefetch all links <Link prefetch={false}> Default prefetch on every link Low
45 44 Link Use scroll option appropriately Control scroll behavior on navigation scroll={false} for tabs pagination Always scroll to top <Link scroll={false}> Manual scroll management Low
46 45 Config Use next.config.js correctly Configure Next.js behavior Proper config options Deprecated or wrong options images: { remotePatterns: [] } images: { domains: [] } Medium https://nextjs.org/docs/app/api-reference/next-config-js
47 46 Config Enable strict mode Catch potential issues early reactStrictMode: true Strict mode disabled reactStrictMode: true reactStrictMode: false Medium
48 47 Config Configure redirects and rewrites Use config for URL management redirects() rewrites() in config Manual redirect handling redirects: async () => [...] res.redirect in pages Medium https://nextjs.org/docs/app/api-reference/next-config-js/redirects
49 48 Deployment Use Vercel for easiest deploy Vercel optimized for Next.js Deploy to Vercel Self-host without knowledge vercel deploy Complex Docker setup for simple app Low https://nextjs.org/docs/app/building-your-application/deploying
50 49 Deployment Configure output for self-hosting Set output option for deployment target output: 'standalone' for Docker Default output for containers output: 'standalone' No output config for Docker Medium https://nextjs.org/docs/app/building-your-application/deploying#self-hosting
51 50 Security Sanitize user input Never trust user input Escape sanitize validate all input Direct interpolation of user data DOMPurify.sanitize(userInput) dangerouslySetInnerHTML={{ __html: userInput }} High
52 51 Security Use CSP headers Content Security Policy for XSS protection Configure CSP in next.config.js No security headers headers() with CSP No CSP configuration High https://nextjs.org/docs/app/building-your-application/configuring/content-security-policy
53 52 Security Validate Server Action input Server Actions are public endpoints Validate and authorize in Server Action Trust Server Action input Auth check + validation in action Direct database call without check High

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No,Category,Guideline,Description,Do,Don't,Code Good,Code Bad,Severity,Docs URL
1,State,Use useState for local state,Simple component state should use useState hook,useState for form inputs toggles counters,Class components this.state,"const [count, setCount] = useState(0)",this.state = { count: 0 },Medium,https://react.dev/reference/react/useState
2,State,Lift state up when needed,Share state between siblings by lifting to parent,Lift shared state to common ancestor,Prop drilling through many levels,Parent holds state passes down,Deep prop chains,Medium,https://react.dev/learn/sharing-state-between-components
3,State,Use useReducer for complex state,Complex state logic benefits from reducer pattern,useReducer for state with multiple sub-values,Multiple useState for related values,useReducer with action types,5+ useState calls that update together,Medium,https://react.dev/reference/react/useReducer
4,State,Avoid unnecessary state,Derive values from existing state when possible,Compute derived values in render,Store derivable values in state,const total = items.reduce(...),"const [total, setTotal] = useState(0)",High,https://react.dev/learn/choosing-the-state-structure
5,State,Initialize state lazily,Use function form for expensive initial state,useState(() => computeExpensive()),useState(computeExpensive()),useState(() => JSON.parse(data)),useState(JSON.parse(data)),Medium,https://react.dev/reference/react/useState#avoiding-recreating-the-initial-state
6,Effects,Clean up effects,Return cleanup function for subscriptions timers,Return cleanup function in useEffect,No cleanup for subscriptions,useEffect(() => { sub(); return unsub; }),useEffect(() => { subscribe(); }),High,https://react.dev/reference/react/useEffect#connecting-to-an-external-system
7,Effects,Specify dependencies correctly,Include all values used inside effect in deps array,All referenced values in dependency array,Empty deps with external references,[value] when using value in effect,[] when using props/state in effect,High,https://react.dev/reference/react/useEffect#specifying-reactive-dependencies
8,Effects,Avoid unnecessary effects,Don't use effects for transforming data or events,Transform data during render handle events directly,useEffect for derived state or event handling,const filtered = items.filter(...),useEffect(() => setFiltered(items.filter(...))),High,https://react.dev/learn/you-might-not-need-an-effect
9,Effects,Use refs for non-reactive values,Store values that don't trigger re-renders in refs,useRef for interval IDs DOM elements,useState for values that don't need render,const intervalRef = useRef(null),"const [intervalId, setIntervalId] = useState()",Medium,https://react.dev/reference/react/useRef
10,Rendering,Use keys properly,Stable unique keys for list items,Use stable IDs as keys,Array index as key for dynamic lists,key={item.id},key={index},High,https://react.dev/learn/rendering-lists#keeping-list-items-in-order-with-key
11,Rendering,Memoize expensive calculations,Use useMemo for costly computations,useMemo for expensive filtering/sorting,Recalculate every render,"useMemo(() => expensive(), [deps])",const result = expensiveCalc(),Medium,https://react.dev/reference/react/useMemo
12,Rendering,Memoize callbacks passed to children,Use useCallback for functions passed as props,useCallback for handlers passed to memoized children,New function reference every render,"useCallback(() => {}, [deps])",const handler = () => {},Medium,https://react.dev/reference/react/useCallback
13,Rendering,Use React.memo wisely,Wrap components that render often with same props,memo for pure components with stable props,memo everything or nothing,memo(ExpensiveList),memo(SimpleButton),Low,https://react.dev/reference/react/memo
14,Rendering,Avoid inline object/array creation in JSX,Create objects outside render or memoize,Define style objects outside component,Inline objects in props,<div style={styles.container}>,<div style={{ margin: 10 }}>,Medium,
15,Components,Keep components small and focused,Single responsibility for each component,One concern per component,Large multi-purpose components,<UserAvatar /><UserName />,<UserCard /> with 500 lines,Medium,
16,Components,Use composition over inheritance,Compose components using children and props,Use children prop for flexibility,Inheritance hierarchies,<Card>{content}</Card>,class SpecialCard extends Card,Medium,https://react.dev/learn/thinking-in-react
17,Components,Colocate related code,Keep related components and hooks together,Related files in same directory,Flat structure with many files,components/User/UserCard.tsx,components/UserCard.tsx + hooks/useUser.ts,Low,
18,Components,Use fragments to avoid extra DOM,Fragment or <> for multiple elements without wrapper,<> for grouping without DOM node,Extra div wrappers,<>{items.map(...)}</>,<div>{items.map(...)}</div>,Low,https://react.dev/reference/react/Fragment
19,Props,Destructure props,Destructure props for cleaner component code,Destructure in function signature,props.name props.value throughout,"function User({ name, age })",function User(props),Low,
20,Props,Provide default props values,Use default parameters or defaultProps,Default values in destructuring,Undefined checks throughout,function Button({ size = 'md' }),if (size === undefined) size = 'md',Low,
21,Props,Avoid prop drilling,Use context or composition for deeply nested data,Context for global data composition for UI,Passing props through 5+ levels,<UserContext.Provider>,<A user={u}><B user={u}><C user={u}>,Medium,https://react.dev/learn/passing-data-deeply-with-context
22,Props,Validate props with TypeScript,Use TypeScript interfaces for prop types,interface Props { name: string },PropTypes or no validation,interface ButtonProps { onClick: () => void },Button.propTypes = {},Medium,
23,Events,Use synthetic events correctly,React normalizes events across browsers,e.preventDefault() e.stopPropagation(),Access native event unnecessarily,onClick={(e) => e.preventDefault()},onClick={(e) => e.nativeEvent.preventDefault()},Low,https://react.dev/reference/react-dom/components/common#react-event-object
24,Events,Avoid binding in render,Use arrow functions in class or hooks,Arrow functions in functional components,bind in render or constructor,const handleClick = () => {},this.handleClick.bind(this),Medium,
25,Events,Pass event handlers not call results,Pass function reference not invocation,onClick={handleClick},onClick={handleClick()} causing immediate call,onClick={handleClick},onClick={handleClick()},High,
26,Forms,Controlled components for forms,Use state to control form inputs,value + onChange for inputs,Uncontrolled inputs with refs,<input value={val} onChange={setVal}>,<input ref={inputRef}>,Medium,https://react.dev/reference/react-dom/components/input#controlling-an-input-with-a-state-variable
27,Forms,Handle form submission properly,Prevent default and handle in submit handler,onSubmit with preventDefault,onClick on submit button only,<form onSubmit={handleSubmit}>,<button onClick={handleSubmit}>,Medium,
28,Forms,Debounce rapid input changes,Debounce search/filter inputs,useDeferredValue or debounce for search,Filter on every keystroke,useDeferredValue(searchTerm),useEffect filtering on every change,Medium,https://react.dev/reference/react/useDeferredValue
29,Hooks,Follow rules of hooks,Only call hooks at top level and in React functions,Hooks at component top level,Hooks in conditions loops or callbacks,"const [x, setX] = useState()","if (cond) { const [x, setX] = useState() }",High,https://react.dev/reference/rules/rules-of-hooks
30,Hooks,Custom hooks for reusable logic,Extract shared stateful logic to custom hooks,useCustomHook for reusable patterns,Duplicate hook logic across components,const { data } = useFetch(url),Duplicate useEffect/useState in components,Medium,https://react.dev/learn/reusing-logic-with-custom-hooks
31,Hooks,Name custom hooks with use prefix,Custom hooks must start with use,useFetch useForm useAuth,fetchData or getData for hook,function useFetch(url),function fetchData(url),High,
32,Context,Use context for global data,Context for theme auth locale,Context for app-wide state,Context for frequently changing data,<ThemeContext.Provider>,Context for form field values,Medium,https://react.dev/learn/passing-data-deeply-with-context
33,Context,Split contexts by concern,Separate contexts for different domains,ThemeContext + AuthContext,One giant AppContext,<ThemeProvider><AuthProvider>,<AppProvider value={{theme user...}}>,Medium,
34,Context,Memoize context values,Prevent unnecessary re-renders with useMemo,useMemo for context value object,New object reference every render,"value={useMemo(() => ({...}), [])}","value={{ user, theme }}",High,
35,Performance,Use React DevTools Profiler,Profile to identify performance bottlenecks,Profile before optimizing,Optimize without measuring,React DevTools Profiler,Guessing at bottlenecks,Medium,https://react.dev/learn/react-developer-tools
36,Performance,Lazy load components,Use React.lazy for code splitting,lazy() for routes and heavy components,Import everything upfront,const Page = lazy(() => import('./Page')),import Page from './Page',Medium,https://react.dev/reference/react/lazy
37,Performance,Virtualize long lists,Use windowing for lists over 100 items,react-window or react-virtual,Render thousands of DOM nodes,<VirtualizedList items={items}/>,{items.map(i => <Item />)},High,
38,Performance,Batch state updates,React 18 auto-batches but be aware,Let React batch related updates,Manual batching with flushSync,setA(1); setB(2); // batched,flushSync(() => setA(1)),Low,https://react.dev/learn/queueing-a-series-of-state-updates
39,ErrorHandling,Use error boundaries,Catch JavaScript errors in component tree,ErrorBoundary wrapping sections,Let errors crash entire app,<ErrorBoundary><App/></ErrorBoundary>,No error handling,High,https://react.dev/reference/react/Component#catching-rendering-errors-with-an-error-boundary
40,ErrorHandling,Handle async errors,Catch errors in async operations,try/catch in async handlers,Unhandled promise rejections,try { await fetch() } catch(e) {},await fetch() // no catch,High,
41,Testing,Test behavior not implementation,Test what user sees and does,Test renders and interactions,Test internal state or methods,expect(screen.getByText('Hello')),expect(component.state.name),Medium,https://testing-library.com/docs/react-testing-library/intro/
42,Testing,Use testing-library queries,Use accessible queries,getByRole getByLabelText,getByTestId for everything,getByRole('button'),getByTestId('submit-btn'),Medium,https://testing-library.com/docs/queries/about#priority
43,Accessibility,Use semantic HTML,Proper HTML elements for their purpose,button for clicks nav for navigation,div with onClick for buttons,<button onClick={...}>,<div onClick={...}>,High,https://react.dev/reference/react-dom/components#all-html-components
44,Accessibility,Manage focus properly,Handle focus for modals dialogs,Focus trap in modals return focus on close,No focus management,useEffect to focus input,Modal without focus trap,High,
45,Accessibility,Announce dynamic content,Use ARIA live regions for updates,aria-live for dynamic updates,Silent updates to screen readers,"<div aria-live=""polite"">{msg}</div>",<div>{msg}</div>,Medium,
46,Accessibility,Label form controls,Associate labels with inputs,htmlFor matching input id,Placeholder as only label,"<label htmlFor=""email"">Email</label>","<input placeholder=""Email""/>",High,
47,TypeScript,Type component props,Define interfaces for all props,interface Props with all prop types,any or missing types,interface Props { name: string },function Component(props: any),High,
48,TypeScript,Type state properly,Provide types for useState,useState<Type>() for complex state,Inferred any types,useState<User | null>(null),useState(null),Medium,
49,TypeScript,Type event handlers,Use React event types,React.ChangeEvent<HTMLInputElement>,Generic Event type,onChange: React.ChangeEvent<HTMLInputElement>,onChange: Event,Medium,
50,TypeScript,Use generics for reusable components,Generic components for flexible typing,Generic props for list components,Union types for flexibility,<List<T> items={T[]}>,<List items={any[]}>,Medium,
51,Patterns,Container/Presentational split,Separate data logic from UI,Container fetches presentational renders,Mixed data and UI in one,<UserContainer><UserView/></UserContainer>,<User /> with fetch and render,Low,
52,Patterns,Render props for flexibility,Share code via render prop pattern,Render prop for customizable rendering,Duplicate logic across components,<DataFetcher render={data => ...}/>,Copy paste fetch logic,Low,https://react.dev/reference/react/cloneElement#passing-data-with-a-render-prop
53,Patterns,Compound components,Related components sharing state,Tab + TabPanel sharing context,Prop drilling between related,<Tabs><Tab/><TabPanel/></Tabs>,<Tabs tabs={[]} panels={[...]}/>,Low,
1 No Category Guideline Description Do Don't Code Good Code Bad Severity Docs URL
2 1 State Use useState for local state Simple component state should use useState hook useState for form inputs toggles counters Class components this.state const [count, setCount] = useState(0) this.state = { count: 0 } Medium https://react.dev/reference/react/useState
3 2 State Lift state up when needed Share state between siblings by lifting to parent Lift shared state to common ancestor Prop drilling through many levels Parent holds state passes down Deep prop chains Medium https://react.dev/learn/sharing-state-between-components
4 3 State Use useReducer for complex state Complex state logic benefits from reducer pattern useReducer for state with multiple sub-values Multiple useState for related values useReducer with action types 5+ useState calls that update together Medium https://react.dev/reference/react/useReducer
5 4 State Avoid unnecessary state Derive values from existing state when possible Compute derived values in render Store derivable values in state const total = items.reduce(...) const [total, setTotal] = useState(0) High https://react.dev/learn/choosing-the-state-structure
6 5 State Initialize state lazily Use function form for expensive initial state useState(() => computeExpensive()) useState(computeExpensive()) useState(() => JSON.parse(data)) useState(JSON.parse(data)) Medium https://react.dev/reference/react/useState#avoiding-recreating-the-initial-state
7 6 Effects Clean up effects Return cleanup function for subscriptions timers Return cleanup function in useEffect No cleanup for subscriptions useEffect(() => { sub(); return unsub; }) useEffect(() => { subscribe(); }) High https://react.dev/reference/react/useEffect#connecting-to-an-external-system
8 7 Effects Specify dependencies correctly Include all values used inside effect in deps array All referenced values in dependency array Empty deps with external references [value] when using value in effect [] when using props/state in effect High https://react.dev/reference/react/useEffect#specifying-reactive-dependencies
9 8 Effects Avoid unnecessary effects Don't use effects for transforming data or events Transform data during render handle events directly useEffect for derived state or event handling const filtered = items.filter(...) useEffect(() => setFiltered(items.filter(...))) High https://react.dev/learn/you-might-not-need-an-effect
10 9 Effects Use refs for non-reactive values Store values that don't trigger re-renders in refs useRef for interval IDs DOM elements useState for values that don't need render const intervalRef = useRef(null) const [intervalId, setIntervalId] = useState() Medium https://react.dev/reference/react/useRef
11 10 Rendering Use keys properly Stable unique keys for list items Use stable IDs as keys Array index as key for dynamic lists key={item.id} key={index} High https://react.dev/learn/rendering-lists#keeping-list-items-in-order-with-key
12 11 Rendering Memoize expensive calculations Use useMemo for costly computations useMemo for expensive filtering/sorting Recalculate every render useMemo(() => expensive(), [deps]) const result = expensiveCalc() Medium https://react.dev/reference/react/useMemo
13 12 Rendering Memoize callbacks passed to children Use useCallback for functions passed as props useCallback for handlers passed to memoized children New function reference every render useCallback(() => {}, [deps]) const handler = () => {} Medium https://react.dev/reference/react/useCallback
14 13 Rendering Use React.memo wisely Wrap components that render often with same props memo for pure components with stable props memo everything or nothing memo(ExpensiveList) memo(SimpleButton) Low https://react.dev/reference/react/memo
15 14 Rendering Avoid inline object/array creation in JSX Create objects outside render or memoize Define style objects outside component Inline objects in props <div style={styles.container}> <div style={{ margin: 10 }}> Medium
16 15 Components Keep components small and focused Single responsibility for each component One concern per component Large multi-purpose components <UserAvatar /><UserName /> <UserCard /> with 500 lines Medium
17 16 Components Use composition over inheritance Compose components using children and props Use children prop for flexibility Inheritance hierarchies <Card>{content}</Card> class SpecialCard extends Card Medium https://react.dev/learn/thinking-in-react
18 17 Components Colocate related code Keep related components and hooks together Related files in same directory Flat structure with many files components/User/UserCard.tsx components/UserCard.tsx + hooks/useUser.ts Low
19 18 Components Use fragments to avoid extra DOM Fragment or <> for multiple elements without wrapper <> for grouping without DOM node Extra div wrappers <>{items.map(...)}</> <div>{items.map(...)}</div> Low https://react.dev/reference/react/Fragment
20 19 Props Destructure props Destructure props for cleaner component code Destructure in function signature props.name props.value throughout function User({ name, age }) function User(props) Low
21 20 Props Provide default props values Use default parameters or defaultProps Default values in destructuring Undefined checks throughout function Button({ size = 'md' }) if (size === undefined) size = 'md' Low
22 21 Props Avoid prop drilling Use context or composition for deeply nested data Context for global data composition for UI Passing props through 5+ levels <UserContext.Provider> <A user={u}><B user={u}><C user={u}> Medium https://react.dev/learn/passing-data-deeply-with-context
23 22 Props Validate props with TypeScript Use TypeScript interfaces for prop types interface Props { name: string } PropTypes or no validation interface ButtonProps { onClick: () => void } Button.propTypes = {} Medium
24 23 Events Use synthetic events correctly React normalizes events across browsers e.preventDefault() e.stopPropagation() Access native event unnecessarily onClick={(e) => e.preventDefault()} onClick={(e) => e.nativeEvent.preventDefault()} Low https://react.dev/reference/react-dom/components/common#react-event-object
25 24 Events Avoid binding in render Use arrow functions in class or hooks Arrow functions in functional components bind in render or constructor const handleClick = () => {} this.handleClick.bind(this) Medium
26 25 Events Pass event handlers not call results Pass function reference not invocation onClick={handleClick} onClick={handleClick()} causing immediate call onClick={handleClick} onClick={handleClick()} High
27 26 Forms Controlled components for forms Use state to control form inputs value + onChange for inputs Uncontrolled inputs with refs <input value={val} onChange={setVal}> <input ref={inputRef}> Medium https://react.dev/reference/react-dom/components/input#controlling-an-input-with-a-state-variable
28 27 Forms Handle form submission properly Prevent default and handle in submit handler onSubmit with preventDefault onClick on submit button only <form onSubmit={handleSubmit}> <button onClick={handleSubmit}> Medium
29 28 Forms Debounce rapid input changes Debounce search/filter inputs useDeferredValue or debounce for search Filter on every keystroke useDeferredValue(searchTerm) useEffect filtering on every change Medium https://react.dev/reference/react/useDeferredValue
30 29 Hooks Follow rules of hooks Only call hooks at top level and in React functions Hooks at component top level Hooks in conditions loops or callbacks const [x, setX] = useState() if (cond) { const [x, setX] = useState() } High https://react.dev/reference/rules/rules-of-hooks
31 30 Hooks Custom hooks for reusable logic Extract shared stateful logic to custom hooks useCustomHook for reusable patterns Duplicate hook logic across components const { data } = useFetch(url) Duplicate useEffect/useState in components Medium https://react.dev/learn/reusing-logic-with-custom-hooks
32 31 Hooks Name custom hooks with use prefix Custom hooks must start with use useFetch useForm useAuth fetchData or getData for hook function useFetch(url) function fetchData(url) High
33 32 Context Use context for global data Context for theme auth locale Context for app-wide state Context for frequently changing data <ThemeContext.Provider> Context for form field values Medium https://react.dev/learn/passing-data-deeply-with-context
34 33 Context Split contexts by concern Separate contexts for different domains ThemeContext + AuthContext One giant AppContext <ThemeProvider><AuthProvider> <AppProvider value={{theme user...}}> Medium
35 34 Context Memoize context values Prevent unnecessary re-renders with useMemo useMemo for context value object New object reference every render value={useMemo(() => ({...}), [])} value={{ user, theme }} High
36 35 Performance Use React DevTools Profiler Profile to identify performance bottlenecks Profile before optimizing Optimize without measuring React DevTools Profiler Guessing at bottlenecks Medium https://react.dev/learn/react-developer-tools
37 36 Performance Lazy load components Use React.lazy for code splitting lazy() for routes and heavy components Import everything upfront const Page = lazy(() => import('./Page')) import Page from './Page' Medium https://react.dev/reference/react/lazy
38 37 Performance Virtualize long lists Use windowing for lists over 100 items react-window or react-virtual Render thousands of DOM nodes <VirtualizedList items={items}/> {items.map(i => <Item />)} High
39 38 Performance Batch state updates React 18 auto-batches but be aware Let React batch related updates Manual batching with flushSync setA(1); setB(2); // batched flushSync(() => setA(1)) Low https://react.dev/learn/queueing-a-series-of-state-updates
40 39 ErrorHandling Use error boundaries Catch JavaScript errors in component tree ErrorBoundary wrapping sections Let errors crash entire app <ErrorBoundary><App/></ErrorBoundary> No error handling High https://react.dev/reference/react/Component#catching-rendering-errors-with-an-error-boundary
41 40 ErrorHandling Handle async errors Catch errors in async operations try/catch in async handlers Unhandled promise rejections try { await fetch() } catch(e) {} await fetch() // no catch High
42 41 Testing Test behavior not implementation Test what user sees and does Test renders and interactions Test internal state or methods expect(screen.getByText('Hello')) expect(component.state.name) Medium https://testing-library.com/docs/react-testing-library/intro/
43 42 Testing Use testing-library queries Use accessible queries getByRole getByLabelText getByTestId for everything getByRole('button') getByTestId('submit-btn') Medium https://testing-library.com/docs/queries/about#priority
44 43 Accessibility Use semantic HTML Proper HTML elements for their purpose button for clicks nav for navigation div with onClick for buttons <button onClick={...}> <div onClick={...}> High https://react.dev/reference/react-dom/components#all-html-components
45 44 Accessibility Manage focus properly Handle focus for modals dialogs Focus trap in modals return focus on close No focus management useEffect to focus input Modal without focus trap High
46 45 Accessibility Announce dynamic content Use ARIA live regions for updates aria-live for dynamic updates Silent updates to screen readers <div aria-live="polite">{msg}</div> <div>{msg}</div> Medium
47 46 Accessibility Label form controls Associate labels with inputs htmlFor matching input id Placeholder as only label <label htmlFor="email">Email</label> <input placeholder="Email"/> High
48 47 TypeScript Type component props Define interfaces for all props interface Props with all prop types any or missing types interface Props { name: string } function Component(props: any) High
49 48 TypeScript Type state properly Provide types for useState useState<Type>() for complex state Inferred any types useState<User | null>(null) useState(null) Medium
50 49 TypeScript Type event handlers Use React event types React.ChangeEvent<HTMLInputElement> Generic Event type onChange: React.ChangeEvent<HTMLInputElement> onChange: Event Medium
51 50 TypeScript Use generics for reusable components Generic components for flexible typing Generic props for list components Union types for flexibility <List<T> items={T[]}> <List items={any[]}> Medium
52 51 Patterns Container/Presentational split Separate data logic from UI Container fetches presentational renders Mixed data and UI in one <UserContainer><UserView/></UserContainer> <User /> with fetch and render Low
53 52 Patterns Render props for flexibility Share code via render prop pattern Render prop for customizable rendering Duplicate logic across components <DataFetcher render={data => ...}/> Copy paste fetch logic Low https://react.dev/reference/react/cloneElement#passing-data-with-a-render-prop
54 53 Patterns Compound components Related components sharing state Tab + TabPanel sharing context Prop drilling between related <Tabs><Tab/><TabPanel/></Tabs> <Tabs tabs={[]} panels={[...]}/> Low

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No,Category,Guideline,Description,Do,Don't,Code Good,Code Bad,Severity,Docs URL
1,Setup,Use CLI for installation,Install components via shadcn CLI for proper setup,npx shadcn@latest add component-name,Manual copy-paste from docs,npx shadcn@latest add button,Copy component code manually,High,https://ui.shadcn.com/docs/cli
2,Setup,Initialize project properly,Run init command to set up components.json and globals.css,npx shadcn@latest init before adding components,Skip init and add components directly,npx shadcn@latest init,npx shadcn@latest add button (without init),High,https://ui.shadcn.com/docs/installation
3,Setup,Configure path aliases,Set up proper import aliases in tsconfig and components.json,Use @/components/ui path aliases,Relative imports like ../../components,import { Button } from "@/components/ui/button",import { Button } from "../../components/ui/button",Medium,https://ui.shadcn.com/docs/installation
4,Theming,Use CSS variables for colors,Define colors as CSS variables in globals.css for theming,CSS variables in :root and .dark,Hardcoded color values in components,bg-primary text-primary-foreground,bg-blue-500 text-white,High,https://ui.shadcn.com/docs/theming
5,Theming,Follow naming convention,Use semantic color names with foreground pattern,primary/primary-foreground secondary/secondary-foreground,Generic color names,--primary --primary-foreground,--blue --light-blue,Medium,https://ui.shadcn.com/docs/theming
6,Theming,Support dark mode,Include .dark class styles for all custom CSS,Define both :root and .dark color schemes,Only light mode colors,.dark { --background: 240 10% 3.9%; },No .dark class styles,High,https://ui.shadcn.com/docs/dark-mode
7,Components,Use component variants,Leverage cva variants for consistent styling,Use variant prop for different styles,Inline conditional classes,<Button variant="destructive">,<Button className={isError ? "bg-red-500" : "bg-blue-500"}>,Medium,https://ui.shadcn.com/docs/components/button
8,Components,Compose with className,Add custom classes via className prop for overrides,Extend with className for one-off customizations,Modify component source directly,<Button className="w-full">,Edit button.tsx to add w-full,Medium,https://ui.shadcn.com/docs/components/button
9,Components,Use size variants consistently,Apply size prop for consistent sizing across components,size="sm" size="lg" for sizing,Mix size classes inconsistently,<Button size="lg">,<Button className="text-lg px-8 py-4">,Medium,https://ui.shadcn.com/docs/components/button
10,Components,Prefer compound components,Use provided sub-components for complex UI,Card + CardHeader + CardContent pattern,Single component with many props,<Card><CardHeader><CardTitle>,<Card title="x" content="y" footer="z">,Medium,https://ui.shadcn.com/docs/components/card
11,Dialog,Use Dialog for modal content,Dialog component for overlay modal windows,Dialog for confirmations forms details,Alert for modal content,<Dialog><DialogContent>,<Alert> styled as modal,High,https://ui.shadcn.com/docs/components/dialog
12,Dialog,Handle dialog state properly,Use open and onOpenChange for controlled dialogs,Controlled state with useState,Uncontrolled with default open only,"<Dialog open={open} onOpenChange={setOpen}>","<Dialog defaultOpen={true}>",Medium,https://ui.shadcn.com/docs/components/dialog
13,Dialog,Include proper dialog structure,Use DialogHeader DialogTitle DialogDescription,Complete semantic structure,Missing title or description,<DialogHeader><DialogTitle><DialogDescription>,<DialogContent><p>Content</p></DialogContent>,High,https://ui.shadcn.com/docs/components/dialog
14,Sheet,Use Sheet for side panels,Sheet component for slide-out panels and drawers,Sheet for navigation filters settings,Dialog for side content,<Sheet side="right">,<Dialog> with slide animation,Medium,https://ui.shadcn.com/docs/components/sheet
15,Sheet,Specify sheet side,Set side prop for sheet slide direction,Explicit side="left" or side="right",Default side without consideration,<Sheet><SheetContent side="left">,<Sheet><SheetContent>,Low,https://ui.shadcn.com/docs/components/sheet
16,Form,Use Form with react-hook-form,Integrate Form component with react-hook-form for validation,useForm + Form + FormField pattern,Custom form handling without Form,<Form {...form}><FormField control={form.control}>,<form onSubmit={handleSubmit}>,High,https://ui.shadcn.com/docs/components/form
17,Form,Use FormField for inputs,Wrap inputs in FormField for proper labeling and errors,FormField + FormItem + FormLabel + FormControl,Input without FormField wrapper,<FormField><FormItem><FormLabel><FormControl><Input>,<Input onChange={...}>,High,https://ui.shadcn.com/docs/components/form
18,Form,Display form messages,Use FormMessage for validation error display,FormMessage after FormControl,Custom error text without FormMessage,<FormControl><Input/></FormControl><FormMessage/>,<Input/>{error && <span>{error}</span>},Medium,https://ui.shadcn.com/docs/components/form
19,Form,Use Zod for validation,Define form schema with Zod for type-safe validation,zodResolver with form schema,Manual validation logic,zodResolver(formSchema),validate: (values) => { if (!values.email) },Medium,https://ui.shadcn.com/docs/components/form
20,Select,Use Select for dropdowns,Select component for option selection,Select for choosing from list,Native select element,<Select><SelectTrigger><SelectContent>,<select><option>,Medium,https://ui.shadcn.com/docs/components/select
21,Select,Structure Select properly,Include Trigger Value Content and Items,Complete Select structure,Missing SelectValue or SelectContent,<SelectTrigger><SelectValue/></SelectTrigger><SelectContent><SelectItem>,<Select><option>,High,https://ui.shadcn.com/docs/components/select
22,Command,Use Command for search,Command component for searchable lists and palettes,Command for command palette search,Input with custom dropdown,<Command><CommandInput><CommandList>,<Input><div className="dropdown">,Medium,https://ui.shadcn.com/docs/components/command
23,Command,Group command items,Use CommandGroup for categorized items,CommandGroup with heading for sections,Flat list without grouping,<CommandGroup heading="Suggestions"><CommandItem>,<CommandItem> without groups,Low,https://ui.shadcn.com/docs/components/command
24,Table,Use Table for data display,Table component for structured data,Table for tabular data display,Div grid for table-like layouts,<Table><TableHeader><TableBody><TableRow>,<div className="grid">,Medium,https://ui.shadcn.com/docs/components/table
25,Table,Include proper table structure,Use TableHeader TableBody TableRow TableCell,Semantic table structure,Missing thead or tbody,<TableHeader><TableRow><TableHead>,<Table><TableRow> without header,High,https://ui.shadcn.com/docs/components/table
26,DataTable,Use DataTable for complex tables,Combine Table with TanStack Table for features,DataTable pattern for sorting filtering pagination,Custom table implementation,useReactTable + Table components,Custom sort filter pagination logic,Medium,https://ui.shadcn.com/docs/components/data-table
27,Tabs,Use Tabs for content switching,Tabs component for tabbed interfaces,Tabs for related content sections,Custom tab implementation,<Tabs><TabsList><TabsTrigger><TabsContent>,<div onClick={() => setTab(...)},Medium,https://ui.shadcn.com/docs/components/tabs
28,Tabs,Set default tab value,Specify defaultValue for initial tab,defaultValue on Tabs component,No default leaving first tab,<Tabs defaultValue="account">,<Tabs> without defaultValue,Low,https://ui.shadcn.com/docs/components/tabs
29,Accordion,Use Accordion for collapsible,Accordion for expandable content sections,Accordion for FAQ settings panels,Custom collapse implementation,<Accordion><AccordionItem><AccordionTrigger>,<div onClick={() => setOpen(!open)}>,Medium,https://ui.shadcn.com/docs/components/accordion
30,Accordion,Choose accordion type,Use type="single" or type="multiple" appropriately,type="single" for one open type="multiple" for many,Default type without consideration,<Accordion type="single" collapsible>,<Accordion> without type,Low,https://ui.shadcn.com/docs/components/accordion
31,Toast,Use Sonner for toasts,Sonner integration for toast notifications,toast() from sonner for notifications,Custom toast implementation,toast("Event created"),setShowToast(true),Medium,https://ui.shadcn.com/docs/components/sonner
32,Toast,Add Toaster to layout,Include Toaster component in root layout,<Toaster /> in app layout,Toaster in individual pages,app/layout.tsx: <Toaster />,page.tsx: <Toaster />,High,https://ui.shadcn.com/docs/components/sonner
33,Toast,Use toast variants,Apply toast.success toast.error for context,Semantic toast methods,Generic toast for all messages,toast.success("Saved!") toast.error("Failed"),toast("Saved!") toast("Failed"),Medium,https://ui.shadcn.com/docs/components/sonner
34,Popover,Use Popover for floating content,Popover for dropdown menus and floating panels,Popover for contextual actions,Absolute positioned divs,<Popover><PopoverTrigger><PopoverContent>,<div className="relative"><div className="absolute">,Medium,https://ui.shadcn.com/docs/components/popover
35,Popover,Handle popover alignment,Use align and side props for positioning,Explicit alignment configuration,Default alignment for all,<PopoverContent align="start" side="bottom">,<PopoverContent>,Low,https://ui.shadcn.com/docs/components/popover
36,DropdownMenu,Use DropdownMenu for actions,DropdownMenu for action lists and context menus,DropdownMenu for user menu actions,Popover for action lists,<DropdownMenu><DropdownMenuTrigger><DropdownMenuContent>,<Popover> for menu actions,Medium,https://ui.shadcn.com/docs/components/dropdown-menu
37,DropdownMenu,Group menu items,Use DropdownMenuGroup and DropdownMenuSeparator,Organized menu with separators,Flat list of items,<DropdownMenuGroup><DropdownMenuItem><DropdownMenuSeparator>,<DropdownMenuItem> without organization,Low,https://ui.shadcn.com/docs/components/dropdown-menu
38,Tooltip,Use Tooltip for hints,Tooltip for icon buttons and truncated text,Tooltip for additional context,Title attribute for tooltips,<Tooltip><TooltipTrigger><TooltipContent>,<button title="Delete">,Medium,https://ui.shadcn.com/docs/components/tooltip
39,Tooltip,Add TooltipProvider,Wrap app or section in TooltipProvider,TooltipProvider at app level,TooltipProvider per tooltip,<TooltipProvider><App/></TooltipProvider>,<Tooltip><TooltipProvider>,High,https://ui.shadcn.com/docs/components/tooltip
40,Skeleton,Use Skeleton for loading,Skeleton component for loading placeholders,Skeleton matching content layout,Spinner for content loading,<Skeleton className="h-4 w-[200px]"/>,<Spinner/> for card loading,Medium,https://ui.shadcn.com/docs/components/skeleton
41,Skeleton,Match skeleton dimensions,Size skeleton to match loaded content,Skeleton same size as expected content,Generic skeleton size,<Skeleton className="h-12 w-12 rounded-full"/>,<Skeleton/> without sizing,Medium,https://ui.shadcn.com/docs/components/skeleton
42,AlertDialog,Use AlertDialog for confirms,AlertDialog for destructive action confirmation,AlertDialog for delete confirmations,Dialog for confirmations,<AlertDialog><AlertDialogTrigger><AlertDialogContent>,<Dialog> for delete confirmation,High,https://ui.shadcn.com/docs/components/alert-dialog
43,AlertDialog,Include action buttons,Use AlertDialogAction and AlertDialogCancel,Standard confirm/cancel pattern,Custom buttons in AlertDialog,<AlertDialogCancel>Cancel</AlertDialogCancel><AlertDialogAction>,<Button>Cancel</Button><Button>Confirm</Button>,Medium,https://ui.shadcn.com/docs/components/alert-dialog
44,Sidebar,Use Sidebar for navigation,Sidebar component for app navigation,Sidebar for main app navigation,Custom sidebar implementation,<SidebarProvider><Sidebar><SidebarContent>,<div className="w-64 fixed">,Medium,https://ui.shadcn.com/docs/components/sidebar
45,Sidebar,Wrap in SidebarProvider,Use SidebarProvider for sidebar state management,SidebarProvider at layout level,Sidebar without provider,<SidebarProvider><Sidebar></SidebarProvider>,<Sidebar> without provider,High,https://ui.shadcn.com/docs/components/sidebar
46,Sidebar,Use SidebarTrigger,Include SidebarTrigger for mobile toggle,SidebarTrigger for responsive toggle,Custom toggle button,<SidebarTrigger/>,<Button onClick={() => toggleSidebar()}>,Medium,https://ui.shadcn.com/docs/components/sidebar
47,Chart,Use Chart for data viz,Chart component with Recharts integration,Chart component for dashboards,Direct Recharts without wrapper,<ChartContainer config={chartConfig}>,<ResponsiveContainer><BarChart>,Medium,https://ui.shadcn.com/docs/components/chart
48,Chart,Define chart config,Create chartConfig for consistent theming,chartConfig with color definitions,Inline colors in charts,"{ desktop: { label: ""Desktop"", color: ""#2563eb"" } }",<Bar fill="#2563eb"/>,Medium,https://ui.shadcn.com/docs/components/chart
49,Chart,Use ChartTooltip,Apply ChartTooltip for interactive charts,ChartTooltip with ChartTooltipContent,Recharts Tooltip directly,<ChartTooltip content={<ChartTooltipContent/>}/>,<Tooltip/> from recharts,Low,https://ui.shadcn.com/docs/components/chart
50,Blocks,Use blocks for scaffolding,Start from shadcn blocks for common layouts,npx shadcn@latest add dashboard-01,Build dashboard from scratch,npx shadcn@latest add login-01,Custom login page from scratch,Medium,https://ui.shadcn.com/blocks
51,Blocks,Customize block components,Modify copied block code to fit needs,Edit block files after installation,Use blocks without modification,Customize dashboard-01 layout,Use dashboard-01 as-is,Low,https://ui.shadcn.com/blocks
52,A11y,Use semantic components,Shadcn components have built-in ARIA,Rely on component accessibility,Override ARIA attributes,<Button> has button role,<div role="button">,High,https://ui.shadcn.com/docs/components/button
53,A11y,Maintain focus management,Dialog Sheet handle focus automatically,Let components manage focus,Custom focus handling,<Dialog> traps focus,document.querySelector().focus(),High,https://ui.shadcn.com/docs/components/dialog
54,A11y,Provide labels,Use FormLabel and aria-label appropriately,FormLabel for form inputs,Placeholder as only label,<FormLabel>Email</FormLabel><Input/>,<Input placeholder="Email"/>,High,https://ui.shadcn.com/docs/components/form
55,Performance,Import components individually,Import only needed components,Named imports from component files,Import all from index,import { Button } from "@/components/ui/button",import { Button Card Dialog } from "@/components/ui",Medium,
56,Performance,Lazy load dialogs,Dynamic import for heavy dialog content,React.lazy for dialog content,Import all dialogs upfront,const HeavyContent = lazy(() => import('./Heavy')),import HeavyContent from './Heavy',Medium,
57,Customization,Extend variants with cva,Add new variants using class-variance-authority,Extend buttonVariants for new styles,Inline classes for variants,"variants: { size: { xl: ""h-14 px-8"" } }",className="h-14 px-8",Medium,https://ui.shadcn.com/docs/components/button
58,Customization,Create custom components,Build new components following shadcn patterns,Use cn() and cva for custom components,Different patterns for custom,const Custom = ({ className }) => <div className={cn("base" className)}>,const Custom = ({ style }) => <div style={style}>,Medium,
59,Patterns,Use asChild for composition,asChild prop for component composition,Slot pattern with asChild,Wrapper divs for composition,<Button asChild><Link href="/">,<Button><Link href="/"></Link></Button>,Medium,https://ui.shadcn.com/docs/components/button
60,Patterns,Combine with React Hook Form,Form + useForm for complete forms,RHF Controller with shadcn inputs,Custom form state management,<FormField control={form.control} name="email">,<Input value={email} onChange={(e) => setEmail(e.target.value)},High,https://ui.shadcn.com/docs/components/form
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