json_annotation | Dart Package (pub.dev)

json_serializable | Dart Package (pub.dev)

build_runner | Dart Package (pub.dev)

import 'package:json_annotation/json_annotation.dart';

part 'Feature.g.dart';

@JsonSerializable()
class Feature{
		factory Feature.fromJson(Map<String, dynamic> json)=> _$FeatureFromJson(json);

Code Generation

Run build_runner to generate the (de)serialization implementations:

flutter packages pub run build_runner build