Next.js Introduction — The React Framework for Production

In this tutorial, you will learn about Next.js Introduction. We cover key concepts, practical examples, and best practices to help you master this topic.

Next.js is a React framework providing server-side rendering, static site generation, file-based routing, API routes, and optimization features for production React applications.

What You'll Learn

• What Next.js adds to React
• Pages Router vs App Router
• Server-side rendering (SSR)
• Static site generation (SSG)
• Incremental static regeneration (ISR)

Why It Matters

Next.js solves React's SEO problems with server-rendered HTML, provides optimized images and fonts, and simplifies routing with a file-system based approach.

// pages/index.jsx (Pages Router)
export default function Home({ posts }) {
  return (
    <div>
      <h1>Next.js Blog</h1>
      {posts.map(post => (
        <article key={post.id}>
          <h2>{post.title}</h2>
          <p>{post.excerpt}</p>
        </article>
      ))}
    </div>
  );
}

export async function getStaticProps() {
  const res = await fetch("https://api.example.com/posts");
  const posts = await res.json();
  return { props: { posts }, revalidate: 3600 };
}

Expected output: A blog page statically generated at build time, with ISR revalidating every hour for fresh content.