dont-work.js

// https://www.npmjs.com/package/url-querystring

var extract = require('url-querystring');
var qs = require('querystring');
var res = extract(window.location.search.substring(1));

qs.parse(res.qs);

console.log(res.qs);

//      RETURNS: Object {}      //

works.js

var extract = require('url-querystring');
var qs = require('querystring');
var res = extract('http://foobar.com/hello?tab=hello&method=something');

qs.parse(res.qs);

console.log(res.qs);

//      RETURNS: Object {tab: "hello", method: "something"}      //