Middleware in Express.js

Middleware in Express.js — a practical guide to Express middleware with clear examples you can reuse in real projects.

Middleware in Express.js — 40/55 in the Node.js series. Full playlist companion: Node.js complete course on YouTube. Prefer one article? Read the complete Node.js tutorial.

Short description

Middleware functions run between the request and the final route handler. Call `next()` to continue, or send a response to stop the chain.

Logger middleware

function logger(req, res, next) {
  console.log(req.method, req.url);
  next();
}

app.use(logger);