Add rate limiting middleware

[davetaz]

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

// Define rate limiting settings
const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100, // Limit each IP to 100 requests per `window` (here, per 15 minutes)
  message: { error: "Too many requests from this IP, please try again after 15 minutes." },
  standardHeaders: true, // Return rate limit info in the `RateLimit-*` headers
  legacyHeaders: false, // Disable the `X-RateLimit-*` headers
});

// Apply the rate limiting middleware to all requests
app.use(limiter);

// Your other middleware and routes here