Glossary

What Is Express.js?

Express.js Web Framework

Express.js is the most popular Node.js web framework. It's minimal, unopinionated, and middleware-based — providing routing and HTTP utilities while letting you choose your database, template engine, and architecture. Most Node.js tutorials and projects start with Express.

How Express.js Works

Express is intentionally simple: define routes (app.get, app.post), add middleware (cors, body-parser, auth), and handle requests. This simplicity is both its strength and weakness — you get flexibility but must make many architectural decisions yourself.

Key Concepts

  • Middleware — Functions that process requests in order — authentication, logging, CORS, body parsing
  • Routing — URL pattern matching with HTTP method handlers — app.get('/users/:id', handler)
  • Minimal Core — Express handles HTTP routing and middleware — everything else (database, auth, validation) is your choice

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Frequently Asked Questions

Express vs Fastify?

Express is simpler and has a larger ecosystem. Fastify is faster (2-3x), has built-in validation, and better TypeScript support. Use Express for simplicity; Fastify for performance.

Is Express still the best Node.js framework?

It's the most popular but not the most modern. Fastify, Hono, and NestJS offer better performance, TypeScript support, and structure. Express is fine for learning and small projects.

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Related Terms

Node.jsJavaScriptAPIREST APIMiddleware

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