Decoding a JSON response in a concise way (version 1) and in a more "official way" (version 2)

smoothies_json_decode.dart

// Version 2: The official way based on https://jsontodart.com converter, with a grain of my salt
import 'dart:convert';

void main() {
  List<SmoothieModel> smoothies = jsonDecode(json_str)
      .map<SmoothieModel>((s) => SmoothieModel.fromJson(s))
      .toList();
  print(smoothies);
}

class SmoothieModel {
  String smoothieName;
  List<String> ingredients = [];

  SmoothieModel({this.smoothieName, this.ingredients});

  SmoothieModel.fromJson(Map<String, dynamic> json) {
    smoothieName = json['smoothie_name'];
    if (json['ingredients'] != null) {
      ingredients = json['ingredients']
          .map<String>((i) => Ingredient.fromJson(i).localizedFoodItemName.en)
          .toList();
    }
  }

  String toString() =>
      "{smoothieName: $smoothieName, ingredients: $ingredients}";
}

class Ingredient {
  LocalizedFoodItemName localizedFoodItemName;

  Ingredient({
    this.localizedFoodItemName,
  });

  Ingredient.fromJson(Map<String, dynamic> json) {
    localizedFoodItemName = json['localizedFoodItemNames'] != null
        ? LocalizedFoodItemName.fromJson(json['localizedFoodItemNames'])
        : LocalizedFoodItemName();
  }

  String toString() => "{localizedFoodItemName: $localizedFoodItemName}";
}

class LocalizedFoodItemName {
  String en;
  String de;
  String pt;

  LocalizedFoodItemName({this.en, this.de, this.pt});

  LocalizedFoodItemName.fromJson(Map<String, dynamic> json) {
    en = json['en'];
    de = json['de'];
    pt = json['pt'];
  }

  String toString() => "{en: $en, de: $de, pt: $pt}";
}

var json_str = """
[{
        "smoothie_name": "Crazy Colada",
        "calories": 320,
        "description": "Enjoy the tropical flavours of coconut and pineapple!",
        "image_path": "assets/smoothie/crazy-colada.jpg",
        "isFavourite": false,
        "ingredients": [
            {
                "identifier": "pineapple",
                "localizedFoodItemNames": {
                    "en": "Pineapple",
                    "de": "Ananas",
                    "pt": "Abacaxi"
                },
                "referenceMass": "165 g",
                "density": "165 g per 1 cup",
                "totalSaturatedFat": "0 g",
                "totalMonounsaturatedFat": "0 g",
                "totalPolyunsaturatedFat": "0.1 g",
                "cholesterol": "0 g",
                "sodium": "2 mg",
                "totalCarbohydrates": "22 g",
                "dietaryFiber": "2.3 g",
                "sugar": "16 g",
                "protein": "0.9 g",
                "calcium": "21.4 mg",
                "potassium": "285 mg",
                "vitaminA": "0.051 mg",
                "vitaminC": "27.9 mg",
                "iron": "0.412 mg"
            },
            {
                "identifier": "almond-milk",
                "localizedFoodItemNames": {
                    "en": "Almond Milk",
                    "de": "Mandelmilch",
                    "pt": "Leite de Amêndoas"
                },
                "referenceMass": "240 g",
                "density": "240 g per 1 cup",
                "totalSaturatedFat": "0 g",
                "totalMonounsaturatedFat": "3 g",
                "totalPolyunsaturatedFat": "1 g",
                "cholesterol": "0 g",
                "sodium": "220 mg",
                "totalCarbohydrates": "1 g",
                "dietaryFiber": "2 g",
                "sugar": "0 g",
                "protein": "10 g",
                "calcium": "482 mg",
                "potassium": "160 mg",
                "vitaminA": "0 g",
                "vitaminC": "0 mg",
                "iron": "1 mg"
            },
            {
                "identifier": "coconut",
                "localizedFoodItemNames": {
                    "en": "Coconut",
                    "de": "Kokosnuss",
                    "pt": "Coco"
                },
                "referenceMass": "80 g",
                "density": "80 g per 1 cup",
                "totalSaturatedFat": "23.8 g",
                "totalMonounsaturatedFat": "1.14 g",
                "totalPolyunsaturatedFat": "0.293 g",
                "cholesterol": "0 g",
                "sodium": "16 mg",
                "totalCarbohydrates": "12.2 g",
                "dietaryFiber": "7.2 g",
                "sugar": "4.98 g",
                "protein": "2.66 g",
                "calcium": "11.2 mg",
                "potassium": "285 mg",
                "vitaminA": "0 mg",
                "vitaminC": "2.64 mg",
                "iron": "1.94 mg"
            }
        ]
    }]
    """;