Error handling in Scripted REST API for JSON format issue

[Ganeshm1]

Hi All,
Hope you are doing well.

I created one scripted rest API and its not working as expected for the below case where Request body is not in proper JSON format. 

If I pass the below proper JSON Format, its working as expected. 

{
  "number": "1234",
   "correlation_id": "55556667777788889",
  "location_id": "test"
}

But when I pass the below improper JSON format, its giving status code as 200 and empty response.
Same issue I observed in REST API Explorer as well.

{
  "number": "1234",
   "correlation_id": 55556667777788889,
  "location_id": "test"
}

Please let me know how I can add a validation if request body is a valid JSON or not in this use case. Thank You!

Best Regards,
Ganesh

[JenniferRah]

The tricky thing here is that the second example is actually proper JSON since the correlation_id is composed of just numbers. It is probably just reading it as a number rather than a string. Could you convert it to a string in your code to get by the issue?

If you are missing a parameter that is not sent at all, you can check for that and then return an error message. It would look something like this: 

(function process( /*RESTAPIRequest*/ request, /*RESTAPIResponse*/ response) {

    var requestBody, responseBody, status, sm;

    try {
        requestBody = request.body;
        var JSONdata = new global.JSON().decode(requestBody.dataString);

        if (JSONdata.number == null || JSONdata.correlation_id == null || JSONdata.location_id == null) {
                    return {
                        "status": "Error",
                        "message": "Missing required parameters.",
                    };
        } else {
            //do stuff
            return {
                "status": "Success",
                "message": "Action completed successfully",
            };
        }
    } catch (ex) {
        res["status"] = "500";
        res["message"] = "An error has occurred";
        response.setBody(JSON.stringify(res));
        status = '500';
    }

})(request, response);