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Build a Custom Rate Limiter in Node.js with Redis

Tutorial April 04, 2025 

// redisClient.js
const redis = require("redis");

const client = redis.createClient({ url: process.env.REDIS_URL });

client.on("error", (err) => console.error("Redis error:", err));
client.connect();

module.exports = client;
// rateLimiter.js
const client = require("./redisClient");

const rateLimiter = (limit = 100, windowSec = 3600) => {
  return async (req, res, next) => {
    const ip = req.ip;
    const key = `rate_limit:${ip}`;

    const current = await client.get(key);

    if (current !== null && parseInt(current) >= limit) {
      return res.status(429).json({ error: "Too many requests. Try later." });
    }

    const multi = client.multi();
    multi.incr(key);
    if (!current) {
      multi.expire(key, windowSec);
    }
    await multi.exec();

    next();
  };
};

module.exports = rateLimiter;

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