class Category { int? id; int? parentId; String? name; Category({this.id, this.parentId, this.name}); factory Category.fromJson(Map json) => Category( id: json['id'] as int?, parentId: json['parent_id'] as int?, name: json['name'] as String?, ); Map toJson() => { 'id': id, 'parent_id': parentId, 'name': name, }; }