var json_data = null;
function get_data(mode){
    $.ajax({
        url: "/json_nodes",
        method: "POST",
        data: {func: "init"},
        success: function(json){
            json_data = json;
            //console.log(json_data);
        }
    });
    //json_data = "hey brp";
    //return json_data;
}

testingvar = get_data();
console.log(testingvar);