Getting Started with Next.js 14: App Router Guide
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Getting Started with Next.js 14: App Router Guide
Next.js 14 introduces the App Router, a revolutionary approach to building React applications. This guide will walk you through the fundamentals and best practices.
What is the App Router?
The App Router is Next.js's modern routing system that replaces the traditional Pages Router. It uses the file system to define routes and supports both server and client components natively.
Key Features
1. Server Components by Default
Server components in Next.js 14 run exclusively on the server, reducing JavaScript sent to the client and improving performance.
tsx// app/posts/page.tsx - This is a Server Component by default export default async function PostsPage() { const posts = await fetchPosts(); return <div>{/* Render posts */}</div>; }
2. Client Components with 'use client'
When you need interactivity, mark components with the 'use client' directive.
tsx'use client'; import { useState } from 'react'; export default function Counter() { const [count, setCount] = useState(0); return <button onClick={() => setCount(count + 1)}>{count}</button>; }
3. Dynamic Routes
Create dynamic routes by using square brackets in your file names.
textapp/ āāā blog/ ā āāā [slug]/ ā ā āāā page.tsx ā āāā page.tsx
Layouts and Nesting
Layouts allow you to create shared UI that persists across multiple pages.
tsx// app/layout.tsx export default function RootLayout({ children }) { return ( <html> <body>{children}</body> </html> ); }
Best Practices
- Use Server Components by Default - They improve performance and reduce bundle size
- Only Use Client Components When Needed - For interactivity and browser APIs
- Leverage Async/Await - Server components support async operations
- Organize Your Routes Clearly - Use meaningful folder structures
Conclusion
Next.js 14's App Router provides a modern, efficient way to build React applications. By understanding server and client components, you can build faster, more maintainable applications.
Written by
Merajul Haque