Next Best Practices

What the source does

• FilesystemNone observedNo reads or writes in the source
• NetworkNone observedNo outbound calls in the source
• ShellNone observedNo commands run in the source
• DependenciesPinnedNothing floats
• SecretsNone foundNo keys in source

Five audit layers

Gates applied: no behavioural pass.

Audit 0.4.1 · source sha 118e61cf1c61 · 16 Oct 2026Report an issue or request a re-scan

• Publisherpedronauck GitHub userOwner of the repository this skill is read from
• Source folderpedronauck/skills/skills/curated/next-best-practicesThe exact folder we audited
• LicenceNot declaredAs the repository states it
• Commit pinned for this verdict118e61cf1c61A new audit runs when the source changes
• Repository statusNot archivedLast push 31 days ago
• Sandboxed runNot runSkills are read, not executed; layer L4 is skipped

Its description: Next.js best practices - file conventions, RSC boundaries, data patterns, async APIs, metadata, error handling, route handlers, image/font optimization, bundling

---
name: next-best-practices
description: Next.js best practices - file conventions, RSC boundaries, data patterns, async APIs, metadata, error handling, route handlers, image/font optimization, bundling
user-invocable: false
---

# Next.js Best Practices

Apply these rules when writing or reviewing Next.js code.

## File Conventions

See [file-conventions.md](./file-conventions.md) for:
- Project structure and special files
- Route segments (dynamic, catch-all, groups)
- Parallel and intercepting routes
- Middleware rename in v16 (middleware → proxy)

## RSC Boundaries

Detect invalid React Server Component patterns.

See [rsc-boundaries.md](./rsc-boundaries.md) for:
- Async client component detection (invalid)
- Non-serializable props detection
- Server Action exceptions

## Async Patterns

Next.js 15+ async API changes.

See [async-patterns.md](./async-patterns.md) for:
- Async `params` and `searchParams`
- Async `cookies()` and `headers()`
- Migration codemod

## Runtime Selection

See [runtime-selection.md](./runtime-selection.md) for:
- Default to Node.js runtime
- When Edge runtime is appropriate

## Directives

See [directives.md](./directives.md) for:
- `'use client'`, `'use server'` (React)
- `'use cache'` (Next.js)

## Functions

See [functions.md](./functions.md) for:
- Navigation hooks: `useRouter`, `usePathname`, `useSearchParams`, `useParams`
- Server functions: `cookies`, `headers`, `draftMode`, `after`
- Generate functions: `generateStaticParams`, `generateMetadata`

## Error Handling

See [error-handling.md](./error-handling.md) for:
- `error.tsx`, `global-error.tsx`, `not-found.tsx`
- `redirect`, `permanentRedirect`, `notFound`
- `forbidden`, `unauthorized` (auth errors)
- `unstable_rethrow` for catch blocks

## Data Patterns

See [data-patterns.md](./data-patterns.md) for:
- Server Components vs Server Actions vs Route Handlers
- Avoiding data waterfalls (`Promise.all`, Suspense, preload)
- Client component data fetching

## Route Handlers

See [route-handlers.md](./route-handlers.md) for:
- `route.ts` basics
- GET handler conflicts with `page.tsx`
- Environment behavior (no React DOM)
- When to use vs Server Actions

## Metadata & OG Images

See [metadata.md](./metadata.md) for:
- Static and dynamic metadata
- `generateMetadata` function
- OG image generation with `next/og`
- File-based metadata conventions

## Image Optimization

See [image.md](./image.md) for:
- Always use `next/image` over `<img>`
- Remote images configuration
- Responsive `sizes` attribute
- Blur placeholders
- Priority loading for LCP

## Font Optimization

See [font.md](./font.md) for:
- `next/font` setup
- Google Fonts, local fonts
- Tailwind CSS integration
- Preloading subsets

## Bundling

See [bundling.md](./bundling.md) for:
- Server-incompatible packages
- CSS imports (not link tags)
- Polyfills (already included)
- ESM/CommonJS issues
- Bundle analysis

## Scripts

See [scripts.md](./scripts.md) for:
- `next/script` vs native script tags
- Inline scripts need `id`
- Loading strategies
- Google Analytics with `@next/third-parties`

## Hydration Errors

See [hydration-error.md](./hydration-error.md) for:
- Common causes (browser APIs, dates, invalid HTML)
- Debugging with error overlay
- Fixes for each cause

## Suspense Boundaries

See [suspense-boundaries.md](./suspense-boundaries.md) for:
- CSR bailout with `useSearchParams` and `usePathname`
- Which hooks require Suspense boundaries

## Parallel & Intercepting Routes

See [parallel-routes.md](./parallel-routes.md) for:
- Modal patterns with `@slot` and `(.)` interceptors
- `default.tsx` for fallbacks
- Closing modals correctly with `router.back()`

## Self-Hosting

See [self-hosting.md](./self-hosting.md) for:
- `output: 'standalone'` for Docker
- Cache handlers for multi-instance ISR
- What works vs needs extra setup

## Debug Tricks

See [debug-tricks.md](./debug-tricks.md) for:
- MCP endpoint for AI-assisted debugging
- Rebuild specific routes with `--debug-build-paths`

Excerpt, first 4,000 characters of SKILL.md, verbatim from the audited commit. It is text from someone else’s repository, quoted so you can judge it before your agent reads it.

git clone https://github.com/pedronauck/skills
git -C skills checkout 118e61cf1c61

Works in

1. 2026-10-16
   ✓SAFE B 89 / 100

   first audit · source 118e61cf1c61

Questions about Next Best Practices

• github.com/pedronauck/skills/tree/main/skills/curated/next-best- — the audited source at commit 118e61cf1c61 and every finding aboveObserved · 16 Oct 2026

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