class MonitorModel { double? memory; double? cpu; double? disk; MonitorModel({this.memory, this.cpu, this.disk}); MonitorModel.fromJson(Map json) { memory = json['memory']; cpu = json['cpu']; disk = json['disk']; } Map toJson() { final Map data = {}; data['memory'] = memory; data['cpu'] = cpu; data['disk'] = disk; return data; } }