DefinitelyTyped/types/express-rate-limit/express-rate-limit-tests.ts

import RateLimit = require("express-rate-limit");

const apiLimiter = new RateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100,
  delayMs: 0 // disabled
});

const createAccountLimiter = new RateLimit({
  windowMs: 60 * 60 * 1000, // 1 hour window
  delayAfter: 1, // begin slowing down responses after the first request
  delayMs: 3 * 1000, // slow down subsequent responses by 3 seconds per request
  max: 5, // start blocking after 5 requests
  message: "Too many accounts created from this IP, please try again after an hour",
  handler: (req, _, next) => next(new Error(`TooManyRequests: ${req.ip}`))
});

const callbackWithFewerParams = new RateLimit({
  handler: (req, res) => res.status(429).json(`TooManyRequests: ${req.ip}`)
});

class SomeStore implements RateLimit.Store {
  incr(key: string, cb: RateLimit.StoreIncrementCallback) { }
  decrement(key: string) { }
  resetKey(key: string) { }
}

const limiterWithStore = new RateLimit({
  store: new SomeStore()
});