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Express

Express is a minimal Node.js framework for building web servers and APIs.

What Is Express​

Express provides routing, middleware, request handling, and response helpers.

It is flexible and often used for REST APIs, server-rendered pages, and backend services.

How To Use Express​

Create an app, define routes, add middleware, and start an HTTP server.

Basic Example​

import express from 'express';

const app = express();

app.get('/health', (req, res) => {
  res.json({ok: true});
});

app.listen(3000);

Common Concepts​

  • Routes connect URLs to handlers.
  • Middleware runs before route handlers.
  • Request objects contain incoming data.
  • Response objects send output.

What To Learn Next​

Learn middleware, validation, authentication, error handling, routers, and database integration.