How to convert a JsonObject to a Map in Java?

2 years ago
Noah Thompson
1 minute

To convert a JSONObject to a Map, you can do so by using the following method:

import org.json.JSONObject;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        JSONObject jsonObject = new JSONObject("{\"name\":\"John\", \"age\":30}");

        Map<String, Object> map = jsonToMap(jsonObject);

        System.out.println(map);
    }

    private static Map<String, Object> jsonToMap(JSONObject jsonObject) {
        Map<String, Object> map = new HashMap<>();

        Iterator<String> keys = jsonObject.keys();
        while (keys.hasNext()) {
            String key = keys.next();
            Object value = jsonObject.get(key);

            if (value instanceof JSONObject) {
                value = jsonToMap((JSONObject) value);
            }

            map.put(key, value);
        }

        return map;
    }
}

In the code above, we first create a JSONObject object, then call the jsonToMap method to convert it to a Map. The jsonToMap method recursively converts the JSONObject to a Map, and if the value in the JSONObject is also a JSONObject, the jsonToMap method is called recursively. Finally, the converted Map is printed out.

The output is: {name=John, age=30}

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