class User { final String id; final String name; final String email; const User({ required this.id, required this.name, required this.email, }); // Optional: Factory constructor to create from JSON factory User.fromJson(Map json) { return User( id: json['id'] ?? '', name: json['name'] ?? '', email: json['email'] ?? '', ); } // Optional: Convert to JSON Map toJson() { return { 'id': id, 'name': name, 'email': email, }; } }