JSON to Array react, jquery

I have json data obtained form my server and i want to put in a list, i already read Convert JSON To Array Javascript and Converting data from JSON to JavaScript array but i can't figure out what of all the options can i use in my code my json is like this:

{"response": {"user": [{"username": "", "description": "", "picture_url": "", "name": "", "phone": ""}]}, "success": true}

and i want to put it on an array like this:

[{username: "",description: "", picture_url: "", name: "", phone: ""}]

what can i do for this? i already try the answers of this: Converting JSON Object into Javascript array

i also try some functions like this:

$.each(data, function(i,obj){
                $(arr).append(obj.username+'</br>');
                $(arr).append(obj.description+'</br>');
                $(arr).append(obj.name+'</br>');
            });

and this:

var results = data;
            var arr = [], item;
            for (var i = 0, len = results.length; i < len; i++) {
                item = results[i];
                arr.push({username: item.username, description: item.description, name: item.name});
            }

but with the second one dont show anything and dont show any error, with the first one, showme an unespecthed error arr is not defined.

via Chebli Mohamed