node.js, can't get response from callback when execute function on a for loop

I want to make a simulation like log in to web application multiple users in node.js I have a function login(), and I execute it in a for loop to simulate log in many users. But when maxThreads > 5, sometimes I don't receive response from callback to request in function login() My code is:

var request = require("request");
var cheerio = require("cheerio");

function login(i){
  uri: "",
  method: "POST",
  timeout: 1000,
  followAllRedirects: true,
  form: {
    email: "",
    password: "password"
}, function (error, response, body) {
    var $ = cheerio.load(body);
    var title = $("title");
    console.log(title.html()+ "-" + i );             

var maxThreads = 10
for(i=0; i<maxThreads; i++){

Example output:

Exapmle title-0
Exapmle title-1
Exapmle title-3
Exapmle title-2
Exapmle title-4

My problem: whan I have more threads - I have more null responses


You could use the async module instead of a for loop. This way you'd have more control over the control flow.

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