nextjs-best-practices
Server Components by default, client interactivity on demand, with structured data fetching and caching strategies.
- Server Components handle data fetching and static content; Client Components ('use client') manage forms, state, and event handlers. Split responsibilities when both are needed.
- Data fetching uses static caching by default, with ISR (time-based revalidation) and dynamic (no-store) options for different freshness requirements.
- Routing relies on file conventions (page.tsx, layout.tsx, loading.tsx, error.tsx) and patterns like route groups, parallel routes, and intercepting routes for modals.
- Caching operates across three layers: request-level (fetch options), data-level (revalidate/tags), and full-route caching with on-demand or time-based revalidation.
- Server Actions handle form submissions and mutations with input validation; avoid 'use client' everywhere, large client bundles, and skipping loading/error boundaries.
Next.js Best Practices
Principles for Next.js App Router development.
1. Server vs Client Components
Decision Tree
Does it need...?
│
├── useState, useEffect, event handlers
│ └── Client Component ('use client')
│
├── Direct data fetching, no interactivity
│ └── Server Component (default)
│
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