How to limit express API request by pricing plan

Question

I am building a public API with a pricing plan. I want to limit API requests to each account and its plan. I use NodeJS and ExpressJS

These code cannot run properly, i cannot next() after return the data. How to solve this middlerware?

 const rateLimit = require("express-rate-limit"); const freePlan = rateLimit({ windowMs: 1 * 60 * 1000, max: 5, message: { error: "Try again after 1 minute" } }) const premiumPlan = rateLimit({ windowMs: 1 * 60 * 1000, max: 30, message: { error: "Try again after 1 minute" } }) function limiter(req, res, next ) { switch (req.body.plan) { case "free": return freePlan break; case "big": return premiumPlan break; default: break; } next(); } module.exports = limiter;

 const express = require('express'); const limiter = require("../middlewares/limiter"); const router = express.Router(); router.get('/', limiter, async (req, res) => { res.send('OK'); }) module.exports = router;

Answer 1

Here is i found answer from github and sharing here..

const rateLimit = require("express-rate-limit");

function isPremium(req) {
  //... your logic to return true false based on premium plan or not
}

const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  // see https://github.com/nfriedly/express-rate-limit#max
  max: function(req, res) {
    if (isPremium(req)) {
      return 30;
    }
    return 5;
  }
});

//  apply to all requests
app.use(limiter);