Next.js: Pages Router (legacy) — пример кода

// pages/blog/[slug].js — SSG with dynamic paths
export async function getStaticPaths() {
  const slugs = await getAllSlugs();
  return {
    paths: slugs.map((slug) => ({ params: { slug } })),
    fallback: 'blocking', // unknown slugs are SSR'd on first hit, then cached
  };
}

export async function getStaticProps({ params }) {
  const post = await getPost(params.slug);
  if (!post) return { notFound: true };      // → 404
  return { props: { post }, revalidate: 60 }; // ISR: re-gen at most every 60s
}

export default function Post({ post }) {
  return {post.title};      // runs on server AND client
}

// pages/api/user.js — API route, Node req/res style
export default function handler(req, res) {
  if (req.method !== 'GET') return res.status(405).end();
  res.status(200).json({ name: 'Ada' });
}