Handling cases where a JSON Key exists or not

Question

I'm using rest-assured to test an API. I want to handle a scenario where a key might not exist

Given:

{
  "shop":{
     "shopId":1892929,
     "name":"bobs shop",
     "type":"grocery"
  }
}

...in which type key is sometimes not present, I am trying to handle as follows, using theJSONObject has method: https://developer.android.com/reference/org/json/JSONObject.html#has(java.lang.String)

//restassured code yields response, passed into a JSONObject
JSONObject jsonObj = new JSONObject(response);

if(jsonObj.has(jsonObj.getJSONObject("shop").getString("type"))){
             logger.info("Shop type found as: " + jsonObj.getJSONObject("shop").getString("type"));
}

This code block always evaluates to false even when type is present.

Where am I going wrong?

Answer 1

You just get Response object from your call and do:

public class Test {

    public static void main(String[] args) {
        Response response = RestAssured
                .get("https://mocki.io/v1/22617277-2eca-4fcf-b7e2-8c80851ef45d");
        if(response.path("shop.type") == null){
            System.out.println("key does not exist");
        }else{
            System.out.println(response.path("shop.type").toString());
        }
    }

}

You can have more complicated jsonpath query. For example if you treat having field with null value in different way than having no field at all you can use find in your jsonpath like I'm showing below:

if(response.path("shop.find{it.getKey() == 'type'}") != null){
    System.out.print("Key exists ");
    if(response.path("shop.type") == null){
        System.out.println("but have null value");
    }else{
        System.out.println("and have not-null value");
    }
}else{
    System.out.println("Key does not exist");
}

Answer 2

Example json:

{
    "priceOne": 1034,
    "priceTwo": {"new":2},
    "priceThree": 7282
}

Checking the value of "new"

       Response response =RestAssured.get("https://newnnnnnnn.free.beeceptor.com").
                        then().extract().response();                
       JSONObject jsonObj = new JSONObject(response.asString());
       String val = (jsonObj.getJSONObject("priceTwo").has("new")) ? response.jsonPath().getString("priceTwo.new"):"not foun";
        
        System.out.println(val);

Try JSONObj.hetJsonobject

As mentioned in above comment you can use response.path("shop.type") == null ? true : false also . But shop.type returns null for non existence and also for {"type": null}