Rate Limiter API

A simple library to easily manage rate limits of APIs without any hassles.

Rate Limiter API image

All Contributors MIT License npm version

Table of Contents

Usage

Browser

<script src="https://cdn.rawgit.com/abhisekp/rate-limiter-api/master/dist/rate-limiter-api.js"></script>

<script type="text/javascript">
  var rateLimiter = RateLimiterAPI()
</script>

NodeJS

$ {sudo -H} npm install -S rate-limiter-api
import RateLimiterAPI from 'rate-limiter-api'

Public Interface


import RateLimiterAPI from 'rate-limiter-api'

const rateLimiter = RateLimiterAPI({
  threshold: 5, // leave `threshold` amount of api requests intact (minimum: 1)
})

Pass an optional threshold value which would limit the total rate limits till the threshold is reached in the current session pulse till rate reset.


const request = rateLimiter.limit(requestHandler) //=> Promise

function requestHandler(responseHandler) {
  fetch('https://api.example.com/get')
    .then((response) => {
      rateLimiter.updateRateLimits({
        rateLimit: response.headers.rateLimit,
        rateRemaining: response.headers.rateRemaining,
        rateReset: response.headers.rateReset,
      })

      responseHandler(null, response.body)
    })
    .catch((err) => {
      responseHandler(err)
    })
}

The limit method is passed a requestHandler which would manage the request and then call the node-style responseHandler callback (which gets passed by the RateLimiter library to the requestHandler function) after the request is successful or unsuccessful accordingly.

The request method returns a Promise.

responseHandler(Error, response)
where the first parameter is the Error object and the seconds parameter is the response.

responseHandler callback must be called to continue getting responses.

Update the rate limits i.e. {rateLimit, rateRemaining, rateReset} got from the header using updateRateLimits method.


request
  .then((response) => {
    console.dir(response, {colors:1})
  })
  .catch((error) => {
    console.error(error.message)
  })

When the request completes, the Promise resolves and can be thenable to get the response or error.

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Technologies Used

Help & Support

Contributors


Abhisek Pattnaik

💻 🎨 📖 💡

This project follows the all-contributors specification.

All types of Contributions are Welcome 🙏

License

MIT © Abhisek Patnaik


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