code: @Override
      public String toJSONString()
      {
          final JSONObject object = toJSONObject();
  
          if (null != object)
          {
              return object.toString();
          }
          return null;
      }
docs: Serializes this Node as a JSON string.
  The JSON string can be deserialized with
  {@link JSONDeserializer#fromString(String)}.
  
  @return JSON string