Function returns Ajax response - Value is undefined? jQuery Ajax [duplicate]

Answer 1

You nailed the problem, ajax is an async operation, you can use the returned data only in the success callback:

function jsonServerResponse(operation, JSOoptionalData) {
    // What that line suppose to do???
        JSOoptionalData = (typeof JSOoptionalData == "undefined") ? 'defaultValue' : JSOoptionalData
        var jqxhr = $.ajax({
            type: "POST",
            url: "process.php",
            data: "apicommand=" + JSOoptionalData,
            dataType: "json", // Change the dataType to json.
            success: function (json) {
                console.log("Response as JS Object:") 
                console.log(json);
            }
        });
}