Ajax and how to select nodes via JSON

Ajax and how to select nodes via JSON

Hi all, I got an success call back from an API in this way, everthing's fine so far.

$.ajax({
crossOrigin: true,
url: url,
success: function(data) {
     console.log(data.result);
}
});


The API dont support JSONP, but i using  http://www.ajax-cross-origin.com/ and store the proxy at google. Fine, but I can only get data back using data.result 
If I use Postman, to me it looks that I should use for example
data.result.ResponseData.Metros[0].DisplayTime to be able to get "Nu" as the image shows.



How should I type the nodes?

If i type for example data.result[0] I got a "{" back - but somehow I cannot select anything after "result", I want to select for example 
 data.result.ResponseData.Metros[0].GroupOfLine or something in this level 

Thanks!