nextjs-app-router-fundamentals

Migrating from Next.js Pages Router to App Router involves setting up the root layout, migrating existing pages into the app directory, and updating navigation conventions to utilize modern Next.js development practices.

File-based routing in Next.js App Router uses special file conventions like page.tsx, layout.tsx, and loading.tsx within the app directory. This structure enables nested layouts and automatically creates route segments based on your folder hierarchy.

Server Components are the default in Next.js App Router for data fetching and static generation, while Client Components require the 'use client' directive for interactive client-side logic. Differentiating them ensures optimal data fetching patterns and performance.

The best way to generate metadata for SEO in Next.js App Router is by using the built-in metadata API. It supports both static metadata objects and dynamic metadata generation functions to optimize search engine visibility.

Data fetching in Next.js App Router occurs directly in Server Components, supporting patterns like parallel fetching. To generate static pages, you use the generateStaticParams function to define dynamic route segments at build time.

Next.js App Router fully supports TypeScript for type-safe routing and component props. Common pitfalls include improper usage of Server vs Client Components and incorrect data fetching patterns, which can be avoided by following established TypeScript best practices.