Getting Started with Next.js 15

Next.js 15 brings exciting new features and improvements to the React framework. In this guide, we'll explore the fundamentals of building applications with the App Router.

What's New in Next.js 15?

Next.js 15 introduces several powerful features:

• Enhanced Server Components: Better performance and reduced JavaScript bundle sizes
• Improved Caching: More intelligent caching strategies
• Turbopack: Faster builds and hot module replacement
• Parallel Routes: Build complex layouts with ease

Getting Started

To create a new Next.js 15 project, run:

pnpm create next-app@latest my-app

This will set up a new Next.js project with all the necessary dependencies.

Project Structure

The App Router uses a file-system based routing approach:

• app/ - Contains your application routes
• app/page.tsx - The home page
• app/layout.tsx - The root layout
• components/ - Reusable React components
• lib/ - Utility functions and helpers

Server Components by Default

One of the biggest changes in Next.js 15 is that components are Server Components by default. This means:

1. Components render on the server
2. No JavaScript is sent to the client by default
3. Better performance and SEO

To create a Client Component, add the "use client" directive at the top of your file.

Conclusion

Next.js 15 provides a powerful foundation for building modern web applications. With Server Components, improved routing, and better performance, it's easier than ever to create fast, scalable applications.

Ready to dive deeper? Check out the official Next.js documentation for more details.