How to parse JSON correctly?

Question

AJAX

For a response like {"service": quantity,"service": quantity}
I used the following code:

$.each(new_data, function (key, value){
            $('#first').find('span#'+key).text(value + ' шт');
        });

Now I don’t understand how to write a response like
{"Country":{"Service":{"cost":Cost,"count":Quantity}}} displayed correctly:( tell me please, I understand js very poorly

Answer 1

$.parseJSON(json)

Answer 2

JSON.parse()