Next.js 15 App Router Guide - Build Modern React Apps
Complete guide to Next.js 15 App Router with Server Components, streaming, and modern React patterns. Learn to build performant web applications.
2 min read
Getting Started with Next.js 15 and the App Router
Next.js 15 represents a significant leap forward in React framework development, introducing powerful new features that make building modern web applications more intuitive and performant than ever before.
What's New in Next.js 15
The App Router is the new paradigm that embraces React's latest features:
- Server Components by default - Better performance and SEO
- Streaming and Suspense - Improved loading experiences
- Built-in SEO optimization - Metadata API and structured data
- Enhanced routing - Nested layouts and loading states
Server Components: The Game Changer
// This runs on the server!
export default async function BlogPage() {
const posts = await fetch("/api/posts").then(r => r.json())
return (
<main>
{posts.map(post => (
<article key={post.id}>
<h2>{post.title}</h2>
<p>{post.excerpt}</p>
</article>
))}
</main>
)
}
Server Components eliminate the need for useEffect hooks for data fetching, reducing bundle size and improving performance.
The Power of Layouts
The new layout system allows for sophisticated UI patterns:
export default function RootLayout({
children,
}: {
children: React.ReactNode
}) {
return (
<html lang="en">
<body>
<Header />
<main>{children}</main>
<Footer />
</body>
</html>
)
}
Getting Started
- Create a new Next.js 15 project:
npx create-next-app@latest my-app --app --typescript
- Start building with Server Components
- Add Client Components only when needed for interactivity
The future of React development is here, and it's more powerful than ever!
