How to check in java if a key is present or the value is null for a key in payload REST JSON

Question

I don't the how-to approach to this problem, I have a payload JSON which is mapped to the model class and I need to validate that if a key is present or its value is null if so return the missing key or null key in the response.

          eg JSON
                 {
                     "serviceID": "Xyz",
                      "billingPIN": "abc", 
                      "customerAccountName": "sam",
                  } 

               Example json with missing key:
                 {
                     "serviceID": "Xyz",
                      "billingPIN": "abc", <---- Customer is missing.
                  }

** Need to construct the response: **

                 {
                     "missingkey":"customerAccountName"
                  }

Any help will be appreciated

read the json (search for similar question on this site), go through all the keys (search for similar question on this site), build the answer (guess what? there is a similar question on this site also) — jhamon, Oct 09 '20 at 12:49
@jhamon I searched for this didn't found something accurate could you please provide me the link, would be really helpful. — Deepak Kumar, Oct 09 '20 at 12:51
[How to parse JSON in Java](https://stackoverflow.com/questions/2591098/how-to-parse-json-in-java) [How to check if a json key exists?](https://stackoverflow.com/questions/17487205/how-to-check-if-a-json-key-exists) — jhamon, Oct 09 '20 at 12:53

score 0 · Answer 1 · answered Oct 09 '20 at 13:32

Try this

var data = {
                     "serviceID": "Xyz",
                      "billingPIN": "abc", 
                      "customerAccountName": "sam",
                  };
                 let value = {}


if(!("customerAccountName" in data) || data["customerAccountName"] == null){
value = {
         "missingkey":"customerAccountName"
        }
        
}

console.log(value)

How to check in java if a key is present or the value is null for a key in payload REST JSON

1 Answers1