Implement API Rate Limiting to Prevent Brute Force Attacks in Node.js Express

const express = require('express');
const rateLimit = require('express-rate-limit');
const app = express();
const port = 3000;

// Apply to all requests
const globalLimiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100, // Limit each IP to 100 requests per windowMs
  message: 'Too many requests from this IP, please try again after 15 minutes',
  standardHeaders: true, // Return rate limit info in the `RateLimit-*` headers
  legacyHeaders: false, // Disable the `X-RateLimit-*` headers
});

// Apply to specific routes, e.g., login or sensitive endpoints
const loginLimiter = rateLimit({
  windowMs: 5 * 60 * 1000, // 5 minutes
  max: 5, // Limit each IP to 5 login requests per windowMs
  message: 'Too many login attempts from this IP, please try again after 5 minutes',
  handler: (req, res) => {
    res.status(429).json({
      success: false,
      message: 'Too many login attempts. Please wait and try again.',
    });
  },
  keyGenerator: (req, res) => req.ip, // Use IP as the key for limiting
});

app.use(globalLimiter); // Apply global rate limiting

app.get('/', (req, res) => {
  res.send('Hello from the rate-limited API!');
});

app.post('/login', loginLimiter, (req, res) => {
  // Your login logic here
  res.send('Login attempt processed.');
});

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