rate-limiter-fn

What is this?

A higher-order function to provide a Rate Limiting mechanism to the given function.

How do I install it?

npm install rate-limiter-fn

How can I use it?

const rateLimiter = require('rate-limiter-fn');

const rateLimitedFn = rateLimiter(fn, {
  limit: 10,
  interval: 1000,
});

rateLimitedFn();

API

The module exports a single function (rateLimit) that takes two arguments:

• fn - The function to be rate limited.
• options - An object with the following properties:
  • limit - The number of times the function can be called within the given interval.
  • interval - The interval in milliseconds.
  • onLimitReached - A function that will be called when the limit is reached. It will be called with the following arguments:
    • identifier - The identifier for the rate limit. This is the value returned by the identifierFn option if given, otherwise it is the function itself.
    • args - The arguments that were passed to the function.
  • identifierFn - A function that will be called to get the identifier for the rate limit. It will be called with the following arguments:
    • fn - The function that was rate limited.
    • args - The arguments that were passed to the function.

Tests

You can run the tests by using the following command:

npm test