Building REST APIs with Express

Express.js is a minimal and flexible Node.js web application framework that provides a robust set of features for building web and API applications.

Setting Up

npm install express

Core Concepts

• Routing: Define endpoints with app.get(), app.post(), etc.
• Middleware: Functions that execute during the request-response cycle.
• Error Handling: Centralized error handling middleware keeps code clean.

Example

import express from "express";
const app = express();

app.get("/api/health", (req, res) => {
  res.json({ status: "ok" });
});

app.listen(3000);