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While deserializing JSON is an extremely common task, there are cases where you also need to serialize some JSON. It's very important to learn how to transform a Dart class into a JSON string. Follow these steps:

1. To perform this task, add a new method to the Pizza class, in the pizza.dart file, called toJson. This will actually return a Map<String, dynamic> from the object:

Map<String, dynamic> toJson() {
  return {
    'id': id,
    'pizzaName': pizzaName,
    'description': description,
    'price': price,
    'imageUrl': imageUrl,
  };
}

2. Once you have a Map, you can serialize it back into a JSON string. Add a new method at the bottom of the _MyHomePageState class, in the main.dart file, called convertToJSON:

String convertToJSON(List<Pizza> pizzas) {
    String json = '[';
pizzas.forEach((pizza) {
    json += jsonEncode(pizza);
    });
    json += ']';
    return json;
}

This method...