Product to json string and back

main.dart

import 'dart:convert';

void main() {
  final p = Product(name: 'gofret', price: '\$1.00', imgUrl: 'img.com');
  print(p);
  print(p.runtimeType);
  
  print("");
  
  final j = json.encode(p);
  print(j);
  print(j.runtimeType);
  
  print("");
  
  final jmap = json.decode(j);
  print(jmap);
  print(jmap.runtimeType);
  
  print("");
  
  final p2 = Product(name: jmap["name"],
                    price: jmap["price"],
                    imgUrl: jmap["imgUrl"]);
  print(p2);
  print(p2.runtimeType);
}

class Product {
  String name;
  String price;
  String imgUrl;

  Product({this.name, this.price, this.imgUrl});

  @override
  String toString() {
    return "Product : { name : $name, price: $price, imgUrl: $imgUrl }";
  }

  @override
  Map<String, dynamic> toJson() => {
        "name": name == null ? null : name,
        "price": price == null ? null : price,
        "imgUrl": imgUrl == null ? null : imgUrl,
      };

  factory Product.fromJson(String str) => Product.fromMap(json.decode(str));

  factory Product.fromMap(Map<String, dynamic> json) => Product(
        name: json["name"] == null ? null : json["name"],
        price: json["price"] == null ? null : json["price"],
        imgUrl: json["imgUrl"] == null ? null : json["imgUrl"],
      );
}