From a VC:VirtualMachine object, to get AdminUUID and XaaSUUID:

ComputerName = VM.Config.name;
VirtualMachineAdminUUID= VM.Config.instanceUuid;
XaasUUID = VM.sdkConnection.about.instanceUuid;

var ErrHandler = System.getModule("SopraSteria.ErrorHandling");
var ErrResult = ErrHandler.VMGuestDecodeError(exception);

System.log(typeof text);	
if (!(text instanceof String))	
 
(To "Read" the instance name you can do this:)
 
Object.prototype.toString.call(string)

//convert to json
json = JSON.parse(data);
// convert from json
JSON.stringify(json)