Next.jsNext.js 15 App Router: The Complete Guide
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Next.js 15 App Router: The Complete Guide
The App Router is now the default way to build Next.js applications. Here's everything you need to know.
Folder Structure
app/
layout.tsx
page.tsx
blog/
page.tsx
[id]/
page.tsx
Every folder with a page.tsx becomes a route automatically.
Server Components by Default
All components in the App Router are server components by default.
export default async function BlogPage() {
const posts = await fetchPosts(); // runs on server
return <PostList posts={posts} />;
}
Client Components
Add 'use client' for interactivity:
'use client';
import { useState } from 'react';
export default function Counter() {
const [count, setCount] = useState(0);
return <button onClick={() => setCount(c => c + 1)}>{count}</button>;
}
Layouts
Layouts persist across routes:
export default function RootLayout({ children }) {
return (
<html>
<body>
<Navbar />
{children}
<Footer />
</body>
</html>
);
}
Final Thoughts
Next.js 15 App Router is the future of React development. Invest time in learning server components — they'll change how you build apps.
Happy Coding!
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Written by Jeevan Bhargav
Creator of InterviewsAce.AI and Frontend Engineer.
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