Explore the powerful new features in Next.js 15 and learn how to build modern web applications with improved performance and developer experience.
Next.js 15 brings enhanced performance, improved developer experience, and powerful new features for building modern web applications.
The App Router has received substantial improvements with better file-based routing, enhanced nested layouts, and improved loading states.
// app/layout.tsx
export default function RootLayout({
children,
}: {
children: React.ReactNode;
}) {
return (
<html lang="en">
<body>{children}</body>
</html>
);
}
Next.js 15 introduces several performance optimizations:
React Server Components are now the default, providing:
Turbopack is now more stable in Next.js 15:
# Enable Turbopack for development
npm run dev --turbo
Middleware has been improved with better performance:
// middleware.ts
import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
export function middleware(request: NextRequest) {
// Add custom logic here
return NextResponse.next();
}
TypeScript integration is now smoother with better type inference, enhanced error messages, and automatic type generation for API routes.
Consider whether a component should be a Server Component or Client Component:
// Server Component (default)
async function ServerComponent() {
const data = await fetchData();
return <div>{data.title}</div>;
}
// Client Component
('use client');
import { useState } from 'react';
function ClientComponent() {
const [count, setCount] = useState(0);
return <button onClick={() => setCount(count + 1)}>{count}</button>;
}
Use the new data fetching patterns:
// app/posts/page.tsx
async function Posts() {
const posts = await fetch('https://api.example.com/posts', {
next: { revalidate: 3600 }, // Revalidate every hour
});
return (
<div>
{posts.map((post) => (
<article key={post.id}>{post.title}</article>
))}
</div>
);
}
Create error boundaries and loading states:
// app/posts/error.tsx
'use client';
export default function Error({
error,
reset,
}: {
error: Error;
reset: () => void;
}) {
return (
<div>
<h2>Something went wrong!</h2>
<button onClick={() => reset()}>Try again</button>
</div>
);
}
To create a new Next.js 15 project:
npx create-next-app@latest my-app
cd my-app
npm run dev
For existing projects, upgrade to Next.js 15:
npm install next@latest react@latest react-dom@latest
Next.js 15 represents the future of React-based web development. With enhanced performance, improved developer experience, and powerful new features, it's perfect for building modern, scalable web applications.
Whether you're building a simple blog or a complex enterprise application, Next.js 15 provides the tools and optimizations you need to succeed.
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