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Express.js

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description Express.js Overview

Express.js is a popular JavaScript framework built on Node.js used to develop web applications and APIs. Its notable flexibility allows developers to create both simple and complex server-side solutions efficiently. It’s particularly useful for those learning web development or building RESTful APIs with JavaScript, offering a modern approach to Node.js application architecture.

help Express.js FAQ

Does Express.js replace Node.js?

No. Express runs on Node.js and supplies routing, middleware, request, and response conveniences on top of Node's HTTP capabilities.

What changed in Express 5 compared with Express 4?

Express 5 supports rejected promises from async route handlers by forwarding them to error middleware. It also changes some routing and response APIs, so an Express 4 application should be checked against the official migration guide.

How do route parameters work in Express?

A route such as `/users/:id` exposes the matched value through `req.params.id`. Query-string values such as `/users?active=true` are separate and appear under `req.query`.

Does Express include database access and authentication?

No. Developers normally add libraries or services for databases, sessions, validation, and authentication, choosing tools such as Passport, Prisma, or Mongoose according to the application.

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