Quicktype, herramienta online para convertir objetos JSON a clases DART (JSON to Dart)

Quicktype es una herramienta online fácil y simple de usar para convertir objetos JSON a Clases en Dart(Flutter) u otros lenguajes. No solo convierte a clases, sino que genera funciones como: toJson, toMap, copyWith y más. Disponible en: https://app.quicktype.io

Ejemplo de objeto JSON:

{
  "description": "car23",
  "coordinate": {
    "lat": -8.0,
    "lng": -79.0
  },
  "affect": "M",
  "type": {
    "id": "bb4e8bec-1ba3-4718-ba0b-958502e62642"
  }
}

Ejemplo de código en Dart:

import 'dart:convert';

class Location {
    final String description;
    final Coordinate coordinate;
    final String affect;
    final Type type;
    Location({
        required this.description,
        required this.coordinate,
        required this.affect,
        required this.type,
    });
    Location copyWith({
        String? description,
        Coordinate? coordinate,
        String? affect,
        Type? type,
    }) =>
        Location(
            description: description ?? this.description,
            coordinate: coordinate ?? this.coordinate,
            affect: affect ?? this.affect,
            type: type ?? this.type,
        );
    factory Location.fromJson(String str) => Location.fromMap(json.decode(str));
    String toJson() => json.encode(toMap());
    factory Location.fromMap(Map<String, dynamic> json) => Location(
        description: json["description"],
        coordinate: Coordinate.fromMap(json["coordinate"]),
        affect: json["affect"],
        type: Type.fromMap(json["type"]),
    );
    Map<String, dynamic> toMap() => {
        "description": description,
        "coordinate": coordinate.toMap(),
        "affect": affect,
        "type": type.toMap(),
    };
}

class Coordinate {
    final int lat;
    final int lng;

    Coordinate({
        required this.lat,
        required this.lng,
    });

    Coordinate copyWith({
        int? lat,
        int? lng,
    }) =>
        Coordinate(
            lat: lat ?? this.lat,
            lng: lng ?? this.lng,
        );

    factory Coordinate.fromJson(String str) => Coordinate.fromMap(json.decode(str));
    String toJson() => json.encode(toMap());
    factory Coordinate.fromMap(Map<String, dynamic> json) => Coordinate(
        lat: json["lat"],
        lng: json["lng"],
    );
    Map<String, dynamic> toMap() => {
        "lat": lat,
        "lng": lng,
    };
}

class Type {
    final String id;
    Type({
        required this.id,
    });

    Type copyWith({
        String? id,
    }) =>
        Type(
            id: id ?? this.id,
        );

    factory Type.fromJson(String str) => Type.fromMap(json.decode(str));
    String toJson() => json.encode(toMap());
    factory Type.fromMap(Map<String, dynamic> json) => Type(
        id: json["id"],
    );
    Map<String, dynamic> toMap() => {
        "id": id,
    };
}