Parse a json result from asp MVC controller and set a variable in javascript with an attribute from the json object.

setJSVarFromMVCJson.js

    function getData(url) {
        var data;
        $.ajax({
            async: false, //thats the trick
            url: url,
            dataType: 'json',
            success: function (response) {
                data = response;
            }
        });
        return data.JsonAttribute;
    }

    var jsVar = getData('@Url.Action("getJson", "Controller")');