How to search/find In JSON with java

Question

I have a below JSON string from the below i want to find/search criteria in JSON String.

1). To find the Number of keys present. 2). To get the values of given key(

Answer 1

Firstly, add json-path dependency in pom

     com.jayway.jsonpath
     json-path
     2.2.0

Create a utility in Base Class that can be reused :

 public static String getValueFromJsonPath(String apiResponse, String jsonPath) {
        return JsonPath.read(apiResponse, jsonPath);
    }

One example of using this method :

getValueFromJsonPath(apiResponse, "$.store.book[0].category");

NOTE : Create overloaded method with different return types depending upon the expected result (like List for fetching a list from json)