How do you create a RESTful API in Express.js?

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To create a RESTful API in Express.js, you define routes that respond to HTTP methods like GET, POST, PUT, and DELETE for managing resources such as users, products, or posts.

🔧 Step-by-Step Example:

const express = require('express');
const app = express();
const port = 3000;

// Middleware to parse JSON
app.use(express.json());

// Sample data
let users = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' }
];

// GET all users
app.get('/users', (req, res) => {
  res.json(users);
});

// GET user by ID
app.get('/users/:id', (req, res) => {
  const user = users.find(u => u.id == req.params.id);
  user ? res.json(user) : res.status(404).send('User not found');
});

// POST - Create new user
app.post('/users', (req, res) => {
  const newUser = { id: users.length + 1, ...req.body };
  users.push(newUser);
  res.status(201).json(newUser);
});

// PUT - Update user
app.put('/users/:id', (req, res) => {
  const index = users.findIndex(u => u.id == req.params.id);
  if (index !== -1) {
    users[index] = { id: +req.params.id, ...req.body };
    res.json(users[index]);
  } else {
    res.status(404).send('User not found');
  }
});

// DELETE user
app.delete('/users/:id', (req, res) => {
  users = users.filter(u => u.id != req.params.id);
  res.status(204).send();
});

// Start server
app.listen(port, () => {
  console.log(`API running at http://localhost:${port}`);
});

This is a basic RESTful API with endpoints to Create, Read, Update, and Delete (CRUD) users. In real apps, you’d connect this to a database like MongoDB or MySQL.

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