nextjs-app-router-patterns

Server Components and Client Components in the Next.js App Router are used by defaulting to server-side rendering and adding the 'use client' directive for interactive UI. This separation optimizes performance by reducing client-side JavaScript.

Data fetching and caching in Next.js 14 is handled within Server Components using the fetch API with built-in caching and revalidation options. This approach ensures efficient data retrieval and automatic cache invalidation for dynamic content.

Data mutations with Server Actions in Next.js are handled by defining asynchronous functions that execute securely on the server. This allows progressive enhancement of forms and direct database updates without creating separate API endpoints.

Parallel routes and intercepting routes in Next.js are used when building complex dynamic UIs like modals and conditional layouts. They allow simultaneous rendering of multiple pages and interception of routing to create seamless modal experiences.

The Next.js App Router supports streaming for React Server Components by progressively sending UI chunks to the client. This technique allows users to see and interact with parts of the page before all data fetching completes.

TypeScript is not required to structure layouts and pages in the Next.js App Router, but it is highly compatible. You can leverage file conventions and rendering modes effectively with standard JavaScript or TypeScript for type safety.