AjaxForm JSON ColdFusion data undefined

AjaxForm JSON ColdFusion data undefined

I am testing with a very simple form.  I am new to js.  The returned data is not outputting to my test alert box.  The alert result:  it worked  [object Object] rather than showing the data in the alert.

The response: {"COLUMNS":["CONTACTID"],"DATA":[[903]]}

My end goal is to populate another form field with the returned contactid.

Any help is appreciated.  Thank you.


<!DOCTYPE html>
<html lang="en">

 
<script> 
    // wait for the DOM to be loaded 
    $(document).ready(function() { 

        // bind 'contactform' and provide a simple callback function 
        $('#contactform').ajaxForm({
            dataType: 'json',
            clearForm: true,
            success: processJson
        });

    function processJson(data) { 
        // 'data' is the json object returned from the server 
        alert("it worked" +  data);
        }

    }); 
</script> 

<!---Form--->
<form id="contactform" action="cfc/insert.cfc?method=insertcontact" method="post"> 
First Name: <input type="text" name="firstname" /> 
Last Name: <input type="text" name="lastname" /> 
<input id="btnSave" type="submit" value="Submit" /> 
</form>

</html>