How to get the Change Request's sys_id inside a Business Rule's Script?

[mg85]

I have a Business Rule with a custom script. The task of this script is to get the JSON of a Change Request by calling a REST message

For this REST message call, the sys_id is the input parameter.

How can I get the sys_id for the current Change Request on which the Business rule is triggered?

var req = new RESTMessage('Get_SN_JSON', 'get');   //this is a pre-defined REST message in the system

req.setStringParameter('sysID', current.sys_id);   //here the current change_request's sys_id should be passed

current.sys_id, getUniqueValue(), current.variables.sys_id, getSystemID()     --- all these return 'undefined'.

[williamsun]

Have you tried the toString method?

current.sys_id.toString()

[mg85]

using "toString()" helped me see the correct sys_id. Thank you!

But when this value is passed to the REST message it shows me [object Object] as response instead of the JSON

var req = new RESTMessage('Get SN JSON', 'get');

req.setStringParameter('sysID', current.sys_id.toString());

myapp.log("sys id: "+ current.sys_id.toString());     //correct sys_id shown here

var resJson = req.execute();

myapp.log("Response: "+ resJson.toString());   //Response: [object Object]     in the logs

With or Without toString()   Response is same. I tried JSON.Stringify() as well. Result is 'undefined'. Any ideas on what is going wrong?

Once I get the correct JSON, it has to be passed as input to another REST message in the script.

[stopping · Accepted solution]

You could try using the following:

var jsonString = new JSON().encode(resJson);

You can't use JSON.stringify in a business rule since I believe that's only a browser-side capability. Thankfully SN has a lot of these capabilities built-in server-side, albeit under slightly different names.

[mg85]

Thank you! That helped me see the 'Response' content.

Response: {"endpoint":"https://myserver.service-now.com/api/now/table/change_request/8dc7b2c30f27e10032c5778ce1050e09","errorCode":"","errorMessage":"","parameters":"sysparm_display_value=true","response":{}}

However, I was expecting to see the actual JSON of the Change Request. When I place the endpoint from this response in the browser, it shows me the JSON correctly indicating that the web service itself is functioning properly.

How can I get the endpoint response JSON instead of what I see above?