import 'package:json_annotation/json_annotation.dart'; part 'user.g.dart'; @JsonSerializable() class User { User({ required this.number, required this.firstName, required this.lastName, required this.mail }); String number; String lastName; String firstName; String mail; factory User.fromJson(Map json) => _$UserFromJson(json); Map toJson() => _$UserToJson(this); }