nextjs-app-router-patterns

Structure Next.js App Router pages by using Server Components to render critical content immediately while wrapping slower data fetches in Suspense boundaries for streaming. This approach ensures fast initial page loads and progressive data hydration.

Migrating from the Next.js Pages Router to App Router involves restructuring routes using the new file conventions, mapping data fetching to Server Components, and replacing API routes with route handlers to optimize rendering modes and avoid common mistakes.

Use parallel and intercepting routes in Next.js to render multiple pages simultaneously and intercept navigation for modals. This pattern uses specific file conventions to manage complex UI states like dashboards and dynamic route interception.

Server Actions in Next.js handle data mutations by executing asynchronous code directly on the server, reducing the need for separate API endpoints. They integrate with caching and revalidation to maintain performant full-stack interactions.

Use Next.js route handlers instead of Server Actions when you need to expose API endpoints for external consumption or handle webhooks. Server Actions are better suited for form mutations and client-invoked server-side logic within your application.

Manage the server-client boundary in Next.js App Router by isolating client-side logic into specific components. This keeps Server Components as the default, optimizing data fetching and streaming while preventing unnecessary JavaScript from shipping to the client.