Can not access javascript variable value

Question

I can not access the value of msgdata outside getJSON().

  function editPost(event) {

        event.preventDefault();

        var msgdata = 'Hi';
        $.getJSON('/users', function (data) { 
                msgdata = prompt("Enter value");
        });
        var newMessage = { 'message': msgdata } 
     }

Any suggestions ?

Answer 1

Because, the GET request completed after newMessage assignment.