gistfile1.js

var getJSON = function(url, successHandler, errorHandler) {
  				var xhr = typeof XMLHttpRequest != 'undefined'
    			? new XMLHttpRequest()
    			: new ActiveXObject('Microsoft.XMLHTTP');
  				xhr.open('get', url, true);
  				xhr.onreadystatechange = function() {
    			var status;
    			var data;
    			// https://xhr.spec.whatwg.org/#dom-xmlhttprequest-readystate
    			if (xhr.readyState == 4) { // `DONE`
      				status = xhr.status;
      				if (status == 200) {
        				data = JSON.parse(xhr.responseText);
        				successHandler && successHandler(data);
      				} else {
        			errorHandler && errorHandler(status);
      				}
    				}
  				};
  				xhr.send();
				};

				getJSON('http://icontrol.herokuapp.com/api/product/1/?format=json', function(data) {
					document.write(data.activated)
				});