nextjs-app-router-patterns

Next.js App Router streaming uses Suspense boundaries to progressively render server components, sending HTML chunks as data resolves to improve perceived performance. You wrap dynamic data-fetching components in Suspense to enable streaming.

Structuring server and client components in Next.js involves keeping data fetching and static logic in server components, while isolating interactivity in client components using the 'use client' directive to optimize performance and UX.

Use parallel routes to compose multi-section layouts like dashboards with independent data streams, and use intercepting routes for modal-like flows such as dynamically displaying product details or authentication modals without full page navigation.

Dynamic SEO metadata in Next.js App Router is handled by exporting a generateMetadata function from your server components, allowing you to fetch data and inject dynamic title and meta tags for SSR and SSG pages.

Migrating from Pages Router to App Router requires restructuring your project directory into the app/ folder, mapping pages to server components, and adapting data fetching logic to the new server-side patterns.

Server Actions are not strictly required but are highly recommended for full-stack Next.js App Router use cases, allowing you to write server-side data mutations directly within client components without creating separate API endpoints.