Vanilla.js Query String parse

get-query-params.js

function getQueryParams() {
  var qd = {};

  if (location.search) {
    location.search.substr(1).split("&").forEach(function(item) {
      var s = item.split("="),
          k = s[0],
          v = s[1] && decodeURIComponent(s[1]);
      (qd[k] = qd[k] || []).push(v)
    })
  }

  return qd;
}