Below is a code snippet you can try:
var myObject = {"COL_SEQ":16,"SERVICE_CD":0.000000,"SERVICE_ID":0.000000,"COL_NAME":"","COL_OPTION":"nosort nofilter","COL_CLASS":"REMOVE_PATIENT","COL_TYPE":"","COL_LABEL":"","COL_OPTION":""};
alert(myObject.COL_SEQ);
alert(myObject.COL_OPTION);
alert(myObject.COL_CLASS);
When running this code, the 2nd alert should display "nosort nofilter". However, it appears blank instead of showing the expected message.
Here is a link to a live example for testing purposes: http://jsfiddle.net/zD7Wm/
Any ideas on why this might be happening?