React Server Components (RSC) are a game-changer for React applications. They enable you to render components on the server and send only the HTML to the client, reducing JavaScript bundle size and improving performance.
What Are Server Components? – By default in Next.js 14 App Router, components are Server Components. They run only on the server, can access databases and file systems directly, and don't ship JavaScript to the client.
When to Use Server vs Client – Use Server Components for data fetching, static content, and layout. Use Client Components (with 'use client') when you need interactivity, hooks, or browser APIs.
Data Fetching – In Server Components, you can fetch data directly without useEffect or data fetching libraries. No loading states needed—the component waits for data before rendering.
Composition – You can pass Server Components as children to Client Components. The server-rendered output is passed as props, so you get the best of both worlds.
Streaming – Use Suspense to stream parts of the page as they become ready. Users see content faster instead of waiting for the entire page.
Best Practices – Keep the client boundary as low as possible. Fetch data in Server Components and pass it down. Use dynamic imports for heavy Client Components when needed.
Server Components are a paradigm shift. Start with the default (server) and add 'use client' only where you need interactivity. Your users will thank you.