Module is not defined in NodeJS

Question

I have this module that consists of AJAX functionality I'm looking to export to my Client Controller, but I'm getting Module is not defined, I'm using NodeJS and the Cloud9 Environment.

AJAX Module

module.exports = {
  appUrl: window.location.origin,
  ready: function(fn) {
    if(typeof fn !== 'function') {
        return;
    }

    if(document.readyState === 'complete') {
        return fn();
    }

    document.addEventListener('DOMContentLoaded', fn, false);
},
  ajaxRequest: function(method, url, callback) {
    var xmlhttp = new XMLHttpRequest();

    xmlhttp.onreadystatechange = function() {
        if(xmlhttp.readyState === 4 && xmlhttp.status === 200) {
            callback(xmlhttp.response);
        }
    };

    xmlhttp.open(method, url, true);
    xmlhttp.send();
  }
};

Client Controller

'use strict';

 var ajaxFunctions = require("../common/ajax-functions.js");

 (function(){

   var profileId = document.querySelector('#profile-id') || null;
   var profileUsername = document.querySelector('#profile-username') || null;
   var profileRepos = document.querySelector('#profile-repos') || null;
   var displayName = document.querySelector('#display-name');
   var apiUrl = ajaxFunctions.appUrl + '/api/:id';

   function updateHtmlElement(data, element, userProperty) {
       element.innerHTML = data[userProperty];
   }

   ajaxFunctions.ready(ajaxFunctions.ajaxRequest('GET', apiUrl, function(data){
       var userObject = JSON.parse(data);

       updateHtmlElement(userObject, displayName, 'displayName');

       if(profileId !== null) {
           updateHtmlElement(userObject, profileId, 'id');
       }

       if(profileUsername !== null) {
           updateHtmlElement(userObject, profileUsername, 'username');
       }

       if(profileRepos !== null) {
           updateHtmlElement(userObject, profileRepos, 'publicRepos');
       }
   }));
})();

Solution

It seems like you're trying to run the code in a browser, and the error you're getting is saying that module is not defined. If this code is intended to be run in a browser, you'll have to package it with Webpack or Browserify first.