Getting Started with Next.js 15

Next.js 15 represents a major evolution in the React framework ecosystem, bringing powerful features like React Server Components, Server Actions, and improved performance through Turbopack.

Why Next.js?

Next.js solves many critical challenges in modern web development:

• Zero-config TypeScript - Start coding immediately with full type safety
• File-based routing - Your folder structure becomes your routing system
• Automatic code splitting - Only load what you need
• Built-in optimization - Images, fonts, and scripts optimized out of the box

Server Components by Default

One of the biggest changes in Next.js 15 is that components are Server Components by default. This means they render on the server, reducing JavaScript sent to the client.

// app/page.tsx - This is a Server Component!
export default async function HomePage() {
  const data = await fetch('https://api.example.com/data');
  const posts = await data.json();
  
  return (
    <div>
      <h1>Latest Posts</h1>
      {posts.map(post => (
        <article key={post.id}>
          <h2>{post.title}</h2>
          <p>{post.excerpt}</p>
        </article>
      ))}
    </div>
  );
}

The App Router

The new App Router uses a folder-based routing system where each folder represents a route segment:

app/
├── page.tsx          → /
├── about/
│   └── page.tsx      → /about
└── blog/
    ├── page.tsx      → /blog
    └── [slug]/
        └── page.tsx  → /blog/:slug

Dynamic Routes

Create dynamic routes with bracket notation:

// app/blog/[slug]/page.tsx
export default function BlogPost({ params }: { params: { slug: string } }) {
  return <h1>Post: {params.slug}</h1>;
}

// Generate static pages at build time
export async function generateStaticParams() {
  const posts = await getAllPosts();
  return posts.map(post => ({ slug: post.slug }));
}

Data Fetching Strategies

Next.js 15 offers flexible data fetching:

1. Server Components - Fetch directly in components
2. Route Handlers - Create API endpoints (route.ts)
3. Server Actions - Mutations without API routes

Performance Optimization

Next.js automatically optimizes your application:

• Automatic Image Optimization with next/image
• Font Optimization with next/font
• Script Optimization with built-in script loading strategies
• Bundle Analysis to identify large dependencies

Conclusion

Next.js 15 is a game-changer for React developers. The combination of Server Components, improved routing, and built-in optimizations makes it the go-to framework for production applications.

Ready to dive deeper? Check out our guide on Type-Safe Content Management next!