Getting Started with Next.js 15 and App Router

Introduction

Next.js 15 brings powerful features for building high-performance web applications. In this post, we'll explore the App Router and how it revolutionizes React development.

What's New in Next.js 15

The App Router introduces several game-changing features:

Server Components

Server Components allow you to render components on the server, reducing JavaScript bundle size and improving performance.

// app/page.tsx
export default async function Page() {
  const data = await fetch('https://api.example.com/data');
  return <div>{data}</div>;
}

Improved Routing

The new file-system based router makes navigation intuitive:

• app/page.tsx → /
• app/about/page.tsx → /about
• app/blog/[slug]/page.tsx → /blog/:slug

Performance Benefits

The App Router provides:

1. Automatic code splitting - Only load what you need
2. Streaming - Show content as it becomes available
3. Parallel data fetching - Load multiple resources simultaneously

Conclusion

Next.js 15 with the App Router is a significant step forward in web development. It combines the best of server and client rendering for optimal performance.