requestThrottler

gistfile1.js

var requestThrottler = require("request-throttler")({
  concurrency: c,
  executionsPerRound: epr,
  roundDuration: millis
});

//Use case 1
requestThrottler(reqOptions, function (error, response, body){
  //...
});

//Use case 2
var eventEmitter = requestThrottler(requestOptions);
eventEmitter.on("request", function (request) {
  request.on('response', function (response){
    //...
  });
});
eventEmitter.on("error", function (error) {
  //...
});