Getting a undefined error while assigning a variable the value from a json payload

[AbineshM]

var payload = JSON.parse(facilityPayload);

var dslDeviceName = (payload.enhSoiuShowServiceOrderReply.intDslAidNumber.dslDeviceName) ;

so if enhSoiuShowServiceOrderReply.intDslAidNumber.dslDeviceName is not present in the payload i am getting a undefined error. I understand why i am getting the error. But not able to figure how to validate it.

i tried JSUtils.notNil it didnt wok. i Also tried using the following function 

function myFunction(obj1) {

            if (obj1 == null) {

                obj1 = "";

            } else if (typeof obj1 == undefined ) {

                obj1 = "";

            }

            return obj1;

        }

still not able to resolve it.

[RaghavSh · Accepted solution]

Put your code in try catch block and then check.

try{
var payload = JSON.parse(facilityPayload);
var dslDeviceName = (payload.enhSoiuShowServiceOrderReply.intDslAidNumber.dslDeviceName) ;
}
catch(e){
}

[AbineshM]

Thanks @RaghavSh ..... it worked.