Get query parameters as an object

getQueryParameters.js

function getQueryParameters(queryString) {
  queryString = (queryString || document.location.search).replace(/(^\?)/, '');

  var queryParams = {};
  if (queryString) {
    var keyVals = queryString.split('&');
    for (var i = 0; i < keyVals.length; i++) {
      var keyVal = keyVals[i].split('=');
      queryParams[keyVal[0]] = decodeURIComponent(keyVal[1].replace(/\+/g, '%20'));
    }
  }
  
  return queryParams;
}