```
import 'package:freezed_annotation/freezed_annotation.dart';

part 'my_class.freezed.dart'; // Important!!
part 'my_class.g.dart'; // Important!!

@freezed
class MyClass with _$MyClass {
  MyClass._();

  factory MyClass({
    String? id,
    String? name,
  }) = _MyClass;

  factory MyClass.fromJson(Map<String, dynamic> json) => _$MyClassFromJson(json);
}
```