Parse URL Query Parameters

parse-query-params.js

function getQueryParameters(str) {
  return (str || document.location.search)
    .replace(/(^\?)/, '')
    .split('&')
    .reduce(function (a, x, i) {
      var n = x.split('='), y = n[0], z = n[1];
      try { z = JSON.parse(z); } catch(e) { }
      a[y] = a[y] ? typeof a[y] == 'object' ? (a[y].push(z) && a[y]) : [a[y], z] : z;
      return a;
    }, {});
}