class Item { final String id; final String name; final int price; final String category; Item({ required this.id, required this.name, required this.price, required this.category, }); factory Item.fromJson(Map json) { return Item( id: json['id'], name: json['name'], price: json['price'], category: json['category'], ); } Map toJson() { return { 'id': id, 'name': name, 'price': price, 'category': category, }; } }