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nextjs-server-components

Build efficient React applications using Next.js Server Components that render on the server, reducing client bundle size, improving performance, and enabling direct database access. Use when fetching data server-side, reducing JavaScript bundle size, accessing databases directly in components, implementing streaming with Suspense, creating layouts that only render once, optimizing Core Web Vitals, or building SEO-friendly applications with server-first architecture.

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Next.js Server Components - React Server Components Patterns

When to use this skill

  • Fetching data directly in Server Components
  • Reducing client-side JavaScript bundle size
  • Accessing databases directly without API routes
  • Implementing streaming rendering with Suspense
  • Creating layouts that render once and persist
  • Optimizing Largest Contentful Paint (LCP)
  • Building SEO-friendly server-rendered applications
  • Using server-only code (database queries, secrets)
  • Implementing server-side data transformations
  • Reducing Time to Interactive (TTI)
  • Building applications with zero client JS by default
  • Combining Server and Client Components effectively

When to use this skill

  • Building Next.js 13+ apps, optimizing component rendering, managing server/client boundaries.
  • When working on related tasks or features
  • During development that requires this expertise

Use when: Building Next.js 13+ apps, optimizing component rendering, managing server/client boundaries.

Key Concepts

Server Components (default in App Router):

  • Run only on server
  • Can directly access databases/APIs
  • Zero client JavaScript
  • Support async/await

Client Components ('use client'):

  • Interactive features
  • Browser APIs
  • React hooks (useState, useEffect, etc.)

Composition Pattern

// ✅ Server Component fetches data
// app/page.tsx
import { ClientComponent } from './ClientComponent';

export default async function Page() {
  const data = await fetchData(); // Server-side
  
  return (
    <div>
      <h1>Server Rendered: {data.title}</h1>
      <ClientComponent initialData={data} />
    </div>
  );
}

// ✅ Client Component handles interactivity
// app/ClientComponent.tsx
'use client';

export function ClientComponent({ initialData }) {
  const [count, setCount] = useState(0);
  
  return <button onClick={() => setCount(count + 1)}>{count}</button>;
}

Pass Server Components as Children

// ✅ Client Component with Server Component children
'use client';

export function ClientLayout({ children }: { children: React.ReactNode }) {
  const [isOpen, setIsOpen] = useState(false);
  
  return (
    <div>
      <button onClick={() => setIsOpen(!isOpen)}>Toggle</button>
      {isOpen && children}
    </div>
  );
}

// Usage - children can be Server Components!
<ClientLayout>
  <ServerDataComponent /> {/* Stays on server */}
</ClientLayout>

When to Use Client Components

Only use 'use client' when you need:

  • useState, useEffect, useContext
  • Browser APIs (localStorage, window)
  • Event handlers (onClick, onChange)
  • Custom hooks
  • Third-party libraries that use React hooks

Resources

Remember: Keep components server-side by default. Only add 'use client' when necessary for interactivity.

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