Express.js is the framework that made Node.js practical for building web applications. Created by TJ Holowaychuk in 2010 and inspired by Ruby’s Sinatra framework, Express provides a thin layer of web application features without obscuring Node.js’s own capabilities. It’s minimal by design, and that minimalism is exactly why it became the default choice for Node.js backends.
Express handles routing, middleware, request/response handling, and template rendering. Its middleware architecture is its defining feature — incoming requests pass through a chain of functions that can modify the request, check authentication, parse body data, handle errors, or perform any other processing. This pattern has influenced virtually every Node.js framework that came after.
The numbers tell the story of Express’s dominance. It gets over 30 million weekly downloads on npm, making it one of the most downloaded packages in the entire JavaScript ecosystem. Stack Overflow surveys consistently show Express as the most popular backend framework among JavaScript developers.
Express is maintained under the OpenJS Foundation (formerly the Node.js Foundation), though the project went through years of slow development and infrequent updates. Express 5, which has been in development for years, has been gradually moving toward a stable release, addressing long-standing issues with error handling and promise support.
Companies using Express include IBM, Uber, Accenture, and countless startups. It’s often the first framework developers learn when moving to backend JavaScript, and it’s the foundation for higher-level frameworks like NestJS.
Express’s minimalism is both its strength and limitation. For simple APIs and web servers, it’s hard to beat. But for larger applications, developers often layer on additional libraries for validation, ORM, authentication, and other concerns that more opinionated frameworks include out of the box. Newer alternatives like Fastify, Hono, and Elysia offer better performance and modern features, but Express’s massive ecosystem and familiarity keep it relevant.
