Dart_model_json

main.dart

class Dog {
  final int id;
  final String name; 
 
  Dog({this.id, this.name}); 
}

solution.dart

class Dog {
  final int id;
  final String name;  
  
  Dog({this.id, this.name});
  
  factory Dog.fromJson(Map<String, dynamic> json) => Dog(
    id: json["id"],
    name: json["name"]
  );
  
  Map<String, dynamic> toJson() => {
    "id":id,
    "name":name,
  };
}