How to iterate through each property element in API response in Katalon studio? - groovy

Question

I'm writing test script in katalon studio to verify response body of the API.My response body is of format:
{
"status": "Success",
"correlationCode": "1234-5678",
"type": {
"id": 51247,
"name": "Student",
},
"data": {
"name": "Sara Nieves",
"gender": "Female",
"dob": "1995-08-06",
"libraryCard": {
"id": "11178",
"type": "Seniors"
},
"qualifications": [
{
"id": "45650986546",
"name": "Graduate Certificate in Environmental Engineering Management"
}
]
}
}
I want to verify that none of the elements return 'null' value. Since, the elements returned for the API response are not static(meaning name, gender etc might not get returned every time) therefore, i can't use something like "data.name" to verify if it has null value. So, i want a generic way to loop through each and every attribute returned and check if its value is returned as null or not.
Any help will be much appreciated. Thanks!

Answer 1

You have the error message:
groovy.lang.MissingMethodException: No signature of method: WSVerification1569811424284$_run_closure1.doCall() is applicable for argument types: (com.kms.katalon.core.testobject.ResponseObject) values: [200 1 KB] 22572.groovy:21)
I assume your response object type: com.kms.katalon.core.testobject.ResponseObject
The code to parse response as json and validate it:
import groovy.json.JsonSlurper
/**
* the recursive method to validate that json object does not have null values
* #param obj - the parsed json object (sequence of maps and lists)
* #param path - a variable to know where the error occurred in json data.
*/
void assertNoNullValue(Object obj, String path='ROOT'){
//the main assertion
assert obj!=null : "value in json could not be null: $path"
if(obj instanceof Map){
//iterate each key-value in map and validate the value recursively
obj.each{k,v-> assertNoNullValue(v,path+".$k") }
} else if(obj instanceof List){
//iterate each value in list and validate the value recursively
obj.eachWithIndex{v,i-> assertNoNullValue(v,path+"[$i]") }
}
}
def response = ...
assert response.isJsonContentType()
def responseText = response.getResponseText()
//parse body
def data = new JsonSlurper().parseText(responseText)
assertNoNullValue(data)

Answer 2

This solution is not as precise as the one suggested by #dagget, but it is a quick check:
def response = '''
{
"status": "Success",
"correlationCode": "1234-5678",
"type": {
"id": 51247,
"name": "Student",
},
"data": {
"name": "Sara Nieves",
"gender": "femmina",
"dob": "1995-08-06",
"libraryCard": {
"id": "11178",
"type": "Seniors"
},
"qualifications": [
{
"id": "45650986546",
"name": "Graduate Certificate in Environmental Engineering Management"
}
]
}
}
'''
assert !response.contains("null")