node-rate-limiter.js

var limiter = new RateLimiter(5, 'minute');var n = 0;
var x = 0;
console.log('0 minute');
setInterval(function() {
  console.log((++x)+' minute');
}, 60000);

setInterval(function() {
 limiter.removeTokens(1, function(err, remainingRequests) {
    console.log('request'+(n++)+' :: '+remainingRequests);
  });
}, 100);