Complete Guide to Next.js App Router

The App Router is a new paradigm in Next.js 13+ that introduces powerful features like Server Components, streaming, and improved developer experience. Let's explore everything you need to know.

What is the App Router?

The App Router is built on React's latest features and provides a more intuitive way to structure your Next.js applications. It uses the app directory instead of the traditional pages directory.

## Key Features

Server Components by Default

Components in the App Router are Server Components by default, which means they run on the server and don't include JavaScript in the client bundle.

// This is a Server Component
export default async function Page() {
  const data = await fetch('https://api.example.com/data');
  const posts = await data.json();

  return (
    

      {posts.map(post => (
        

          
{post.title}

          
{post.excerpt}

        

      ))}
    

  );
}

### Client Components

When you need interactivity, use the "use client" directive.

"use client"

import { useState } from 'react';

export default function Counter() {
  const [count, setCount] = useState(0);

  return (
     setCount(count + 1)}>
      Count: {count}
    
  );
}

## Conclusion

The App Router represents the future of Next.js development. It provides better performance, improved developer experience, and leverages the latest React features.