Nextjs

Next.js is an open-source React framework for building production-grade web applications. Developed and maintained by Vercel (formerly Zeit) and the broader community, it extends React with features intended to improve rendering performance and developer experience.

Applications built with Next.js can employ server-side rendering (SSR) to render pages on the server, static site generation (SSG) to pre-render pages at build time, or client-side rendering for interactivity. It also supports incremental static regeneration (ISR), allowing static pages to be updated after deployment without a full rebuild.

Routing in Next.js is based on the file-system. The pages directory exposes routes where files map to URLs, and dynamic routes can be created with square-bracket file names (for example, pages/posts/[id].js). Data can be fetched via getStaticProps, getServerSideProps, or getStaticPaths, with revalidation options to refresh content.

Other features include API routes for building backend endpoints under the same project (pages/api/*), image optimization with the next/image component, and built-in support for CSS, CSS Modules, Sass, and various styling approaches (including CSS-in-JS). Performance is aided by automatic code-splitting, prefetching of linked pages, and, optionally, middleware for edge-like behavior.

Next.js can run on Node.js servers or as serverless functions and is commonly deployed on Vercel, though it is also usable with other hosting providers. It is released under the MIT license and has an active community and ecosystem of plugins and integrations.