Mastering Next.js App Router: Server Components & Beyond

## The App Router Revolution Next.js 13 introduced the App Router, fundamentally changing how we build React applications. Let's explore the key concepts and patterns. ## Server Components by Default In the App Router, components are Server Components by default: ```tsx // This runs on the server async function BlogList() { const posts = await getPosts(); // Direct database access! return (

{posts.map(post => (
• {post.title}
))}

); } ``` ## When to Use Client Components Add `"use client"` when you need: - Event handlers (onClick, onChange) - Browser APIs - State management (useState, useEffect) ## Data Fetching Patterns ### Parallel Data Fetching ```tsx async function Page() { const [posts, user] = await Promise.all([ getPosts(), getUser() ]); return ; } ``` ## Performance Benefits - Smaller JavaScript bundles - Faster initial page loads - Better SEO out of the box ## Conclusion The App Router represents the future of React development. Embrace server components and enjoy the performance benefits!