Apparently this is a JSONP request. You have to wrap your entire JSON response with the callback you specified in the URL, which is "callback" in this case:

callback( {"job_Description":"My Job","job_Notes":"My jobs notes are here."} )

http://bob.pythonmac.org/archives/2005/12/05/remote-json-jsonp/

If cross-site scripting is not required, you can simply change this line from

var url = "http://127.0.0.1/projects/client_api/test?callback=?";

to

var url = "http://127.0.0.1/projects/client_api/test";

It seems like you haven't yet parsed this json string.

With jQuery, try:

jQuery.post( url, data, callback, "json") ;
or
jQuery.getJSON( url, data, callback );

for more information please visit
http://thecodecentral.com/2007/11/20/the-missing-parameter-of-jquerypost.

Without jQuery:

eval('('+'{"job_Description":"My Job","job_Notes":"My jobs notes are here."}'+')');

Unable to post json string ?

var url = "http://127.0.0.1/projects/client_api/test?callback=?";
$.getJSON(url,
function(data){
alert(data);
});

heres the json that I'm getting using zend_json:

job_Description

and here's the php in case it helps

$json = new Zend_Json();
$job_data = array(
'job_Description' => 'My Job' ,
'job_Notes' => 'My jobs notes are here.');

echo $json->encode($job_data);