rateLimit.js

const Redis = require("ioredis");
const redis = new Redis();

app.use(async (req, res, next) => {
    const userIp = req.ip;
    const currentTime = Date.now();
    const rateLimit = 100; // Number of requests per hour
    const rateLimitPeriod = 3600; // 1 hour
    const rateLimitKey = `rate_limit:${userIp}`;

    const requests = await redis.lrange(rateLimitKey, 0, -1);
    const filteredRequests = requests.filter(r => currentTime - r < rateLimitPeriod);
    await redis.ltrim(rateLimitKey, filteredRequests.length, -1);
    await redis.rpush(rateLimitKey, currentTime);

    if (filteredRequests.length >= rateLimit) {
        return res.status(429).send("Too Many Requests");
    }
    next();
});