nextjs-app-router-patterns

Server and Client Component separation in the Next.js App Router relies on file conventions and the 'use client' directive to establish boundaries. This pattern optimizes data fetching on the server while preserving interactivity on the client.

Parallel and intercepting routes in Next.js use specific file conventions to render multiple components simultaneously and capture navigation events. These patterns optimize complex loading states and modals without full page transitions.

Data fetching and caching in Server Components leverage the App Router's built-in caching mechanisms and incremental rendering. This approach streamlines SSR and SSG workflows by moving data requests directly to the server.

Streaming in the Next.js App Router progressively sends UI chunks to the client by suspending component rendering during data fetches. This mechanism improves initial load performance by displaying fallback states immediately.

Route handlers are needed in Next.js when building backend API endpoints within the App Router file system. They process web requests and return responses, integrating seamlessly with caching and Server Component data flows.

Yes, these Next.js patterns apply to both new and migrating projects adopting the App Router. They provide architectural conventions for restructuring existing routes, metadata, and data fetching logic.