Expert70 min read
React 19 Server Components and Next.js Integration
Master React Server Components, streaming SSR, and integration with Next.js App Router.
Topics Covered:
Server ComponentsStreaming SSRNext.js App RouterData Fetching
Prerequisites:
- Advanced State Management Patterns
Overview
Server Components run on the server, reducing JavaScript sent to clients. Next.js provides excellent integration with Server Components.
Server vs Client Components
Server Components render on the server and send HTML to the client. They can't use hooks or browser APIs but reduce bundle size significantly.
Code Example:
// Server Component (default in Next.js App Router)
async function ServerComponent() {
// Can access server resources directly
const data = await fetch('https://api.example.com/data');
return <div>{/* Rendered on server */}</div>;
}
// Client Component (needs 'use client')
'use client';
function ClientComponent() {
const [state, setState] = useState(0);
// Can use hooks and browser APIs
return <button onClick={() => setState(state + 1)}>Click</button>;
}Use Server Components by default. Add 'use client' only when you need interactivity, hooks, or browser APIs.
Streaming SSR
Streaming allows React to send HTML incrementally as it renders, improving perceived performance. Users see content sooner.
Conclusion
Server Components are the future of React. They enable better performance and simpler data fetching.