[Help making a JSON request to work]

Hi,

 

I'm using a JSON request to get some data. This data will be used in a dinamic page. The doubt is after making a xmlhttp request i need the page to understand the code. I'm using

 

if (this.readyState == 4 && this.status == 200) {
var myObj = JSON.parse(this.responseText);
	for (x in myObj.data) {
	document.write(''+ myObj.data[x].url +'');
}
}

 

For the JSON

{"status_code":200,"status_txt":"OK","data":{"url":"http://bit.ly/2eFeMvZ","hash":"2eFeMvZ","global_hash":"2V6CFi","long_url":"http://www.google.com/","new_hash":0}}

 

But it isn't correct, can anyone help me or point to a good JSON tutorial

 

Thanks