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Backend & APIs
Express
Latestv5.2.1Updated Dec 1, 2025
Overview
Express.js, or simply Express, is a back end web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.js.
Read moreHow it works
js
const express = require("express");
const app = express();
app.get("/", (req, res) => res.send("Hello, World!"));
app.listen(3000);The flow
Step by step, from source to running.
- 1Request hits the Express app
- 2Passes through the middleware chain
- 3Matched route handler runs
- 4Response sent back
Latest changes
v5.2.1 · Dec 1, 2025
- Release: 5.2.1 in https://github.com/expressjs/express/pull/6933