What is rate limiting in Express and how can I implement it?

What is rate limiting in Express and how can I implement it?

Rate limiting is a technique used to control the amount of incoming requests to a server. In Express, you can implement it using middleware.

Can you show me an example of how to set it up?

Sure! You can use the express-rate-limit package. First, install it using npm, then set it up like this:

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

const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100 // limit each IP to 100 requests per windowMs
});

app.use(limiter);

What happens if a user exceeds the limit?

If a user exceeds the limit, they will receive a 429 Too Many Requests response, indicating that they have made too many requests in a given time frame.