Next.js 14 App Router: Complete Migration and Performance Guide

Introduction

Next.js 14 introduces the App Router as a modern routing solution offering improved performance and better developer ergonomics.

Migration Guide

• Replace pages/ with app/ directory
• Use layout.js and page.js to structure your routes
• Migrate APIs using the new route handlers

Performance Tips

Use streaming, React Server Components, and built-in caching mechanisms to boost load times.

Conclusion

Migrating to the App Router unlocks advanced features and long-term support. Start gradually to minimize friction.