document.cookies returns an object containing key value pairs of all the document's cookies.

document.cookies.js

// document.cookies
// getter property accessor
// returns Object
//
// Examples:
// var cookies = document.cookies;
// var mycookie = document.cookies.mycookie;

if (typeof Document.prototype.cookies == 'undefined') {
  Object.defineProperty(Document.prototype, "cookies", {
    get: function () {
      var object = {};
      document.cookie.split(';').forEach(function (item) {
        var regexp = new RegExp("^ ?(.+?)=(.*?)$");
        var result = regexp.exec(item);
        result && (object[result[1]] = result[2]);
      });
      return object;
    }
  });
}