NextJS

Next.js is a React framework created by Vercel in 2016. It adds server-side rendering, static site generation, and file-based routing to React, handling the infrastructure that React itself leaves to application developers — bundling, code splitting, data fetching, and caching.

The current release is Next.js 16. The App Router (introduced in version 13) provides nested layouts, React Server Components, and Server Actions for handling form submissions and mutations on the server. Turbopack has replaced webpack as the default bundler for both development and production builds, delivering faster compile times. Middleware runs at the edge before requests reach the application, enabling authentication checks, redirects, and header manipulation.

The official documentation covers both the App Router and Pages Router patterns. The source code is on GitHub under the MIT license.