React-Native Module, ReadableMap/Array to Java JSON objects

ReactNativeJson.java

public static WritableMap convertJsonToMap(JSONObject jsonObject) throws JSONException {
WritableMap map = new WritableNativeMap();

Iterator<String> iterator = jsonObject.keys();
while (iterator.hasNext()) {
  String key = iterator.next();
  Object value = jsonObject.get(key);
  if (value instanceof JSONObject) {
    map.putMap(key, convertJsonToMap((JSONObject) value));
  } else if (value instanceof JSONArray) {
    map.putArray(key, convertJsonToArray((JSONArray) value));
  } else if (value instanceof Boolean) {
    map.putBoolean(key, (Boolean) value);
  } else if (value instanceof Integer) {
    map.putInt(key, (Integer) value);
  } else if (value instanceof Double) {
    map.putDouble(key, (Double) value);
  } else if (jsonObject.isNull(key)) {
    map.putNull(key);
  } else if (value instanceof String) {
    map.putString(key, (String) value);
  } else {
    map.putString(key, value.toString());
  }
}
return map;
}

public static WritableArray convertJsonToArray(JSONArray jsonArray) throws JSONException {
WritableArray array = new WritableNativeArray();

for (int i = 0; i < jsonArray.length(); i++) {
  Object value = jsonArray.get(i);
  if (value instanceof JSONObject) {
    array.pushMap(convertJsonToMap((JSONObject) value));
  } else if (value instanceof JSONArray) {
    array.pushArray(convertJsonToArray((JSONArray) value));
  } else if (value instanceof Boolean) {
    array.pushBoolean((Boolean) value);
  } else if (value instanceof Integer) {
    array.pushInt((Integer) value);
  } else if (value instanceof Double) {
    array.pushDouble((Double) value);
  } else if (jsonArray.isNull(i)) {
    array.pushNull();
  } else if (value instanceof String) {
    array.pushString((String) value);
  } else {
    array.pushString(value.toString());
  }
}
return array;
}

public static JSONObject convertMapToJson(ReadableMap readableMap) throws JSONException {
JSONObject object = new JSONObject();
ReadableMapKeySetIterator iterator = readableMap.keySetIterator();
while (iterator.hasNextKey()) {
  String key = iterator.nextKey();
  switch (readableMap.getType(key)) {
    case Null:
      object.put(key, JSONObject.NULL);
      break;
    case Boolean:
      object.put(key, readableMap.getBoolean(key));
      break;
    case Number:
      object.put(key, readableMap.getDouble(key));
      break;
    case String:
      object.put(key, readableMap.getString(key));
      break;
    case Map:
      object.put(key, convertMapToJson(readableMap.getMap(key)));
      break;
    case Array:
      object.put(key, convertArrayToJson(readableMap.getArray(key)));
      break;
  }
}
return object;
}

public static JSONArray convertArrayToJson(ReadableArray readableArray) throws JSONException {
JSONArray array = new JSONArray();
for (int i = 0; i < readableArray.size(); i++) {
  switch (readableArray.getType(i)) {
    case Null:
      array.put(key, JSONObject.NULL);
      break;
    case Boolean:
      array.put(readableArray.getBoolean(i));
      break;
    case Number:
      array.put(readableArray.getDouble(i));
      break;
    case String:
      array.put(readableArray.getString(i));
      break;
    case Map:
      array.put(convertMapToJson(readableArray.getMap(i)));
      break;
    case Array:
      array.put(convertArrayToJson(readableArray.getArray(i)));
      break;
  }
}
return array;
}

With null handling