Getting Started with Next.js 15

Introduction

Next.js 15 brings exciting new features and improvements that make building web applications even more enjoyable. In this guide, we'll explore the key concepts you need to know to get started.

The App Router

The App Router is the new routing system in Next.js that uses React Server Components by default. This allows for better performance and a more intuitive file-based routing structure.

Key Features

Creating Your First Page

To create a page in Next.js 15, simply add a `page.tsx` file in the `app` directory:

// app/page.tsx

export default function HomePage() {

return (

<main>

<h1>Welcome to Next.js 15!</h1>

</main>

);

}

Server Components vs Client Components

By default, components in the App Router are Server Components. To use client-side features like hooks, you need to add the "use client" directive:

"use client";

import { useState } from "react";

export function Counter() {

const [count, setCount] = useState(0);

return (

<button onClick={() => setCount(count + 1)}>

Count: {count}

</button>

);

}

Conclusion

Next.js 15 provides a powerful foundation for building modern web applications. The App Router, Server Components, and improved developer experience make it an excellent choice for your next project.