How can I implement rate limiting in my Express app using Redis?

How can I implement rate limiting in my Express app using Redis?

You can use the express-rate-limit package along with Redis to manage rate limiting. First, install the necessary packages.

What packages do I need to install?

You need to install express, express-rate-limit, and redis. You can do this using npm: npm install express express-rate-limit redis.

Can you show me a code example?

Sure! Here's a simple example:

const express = require('express');
const rateLimit = require('express-rate-limit');
const RedisStore = require('rate-limit-redis');
const redis = require('redis');

const app = express();
const client = redis.createClient();

const limiter = rateLimit({
  store: new RedisStore({
    client,
  }),
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100, // limit each IP to 100 requests per windowMs
});

app.use(limiter);

app.get('/', (req, res) => {
  res.send('Hello, world!');
});

app.listen(3000, () => {
  console.log('Server running on port 3000');
});

This code sets up a rate limiter that allows 100 requests per 15 minutes.

What if I want to customize the rate limit?

You can customize the windowMs and max options in the rate limiter configuration to suit your needs.