block5.dart

/// ClientModel.dart
import 'dart:convert';

Client clientFromJson(String str) {
  final jsonData = json.decode(str);
  return Client.fromMap(jsonData);
}

String clientToJson(Client data) {
  final dyn = data.toMap();
  return json.encode(dyn);
}

class Client {
  int id;
  String firstName;
  String lastName;
  bool blocked;

  Client({
    this.id,
    this.firstName,
    this.lastName,
    this.blocked,
  });

  factory Client.fromMap(Map<String, dynamic> json) => new Client(
        id: json["id"],
        firstName: json["first_name"],
        lastName: json["last_name"],
        blocked: json["blocked"] == 1,
      );

  Map<String, dynamic> toMap() => {
        "id": id,
        "first_name": firstName,
        "last_name": lastName,
        "blocked": blocked,
      };
}

Shouldn't the code be with the tomap and frommap methods?

import 'dart:convert';

Client clientFromJson(String str) {
  final jsonData = json.decode(str);
  return Client.fromMap(jsonData);
}

String clientToJson(Client data) {
  final dyn = data.toMap();
  return json.encode(dyn);
}

class Client {
  int id;
  String firstName;
  String lastName;
  bool blocked;

  Client({
    this.id,
    this.firstName,
    this.lastName,
    this.blocked,
  });

  factory Client.fromMap(Map<String, dynamic> json) => new Client(
        id: json["id"],
        firstName: json["first_name"],
        lastName: json["last_name"],
        blocked: json["blocked"] == 1,
      );

  Map<String, dynamic> toMap() => {
        "id": id,
        "first_name": firstName,
        "last_name": lastName,
        "blocked": blocked,
      };
}

Shouldn't the code be with the tomap and frommap methods?

import 'dart:convert';

Client clientFromJson(String str) {
  final jsonData = json.decode(str);
  return Client.fromMap(jsonData);
}

String clientToJson(Client data) {
  final dyn = data.toMap();
  return json.encode(dyn);
}

class Client {
  int id;
  String firstName;
  String lastName;
  bool blocked;

  Client({
    this.id,
    this.firstName,
    this.lastName,
    this.blocked,
  });

  factory Client.fromMap(Map<String, dynamic> json) => new Client(
        id: json["id"],
        firstName: json["first_name"],
        lastName: json["last_name"],
        blocked: json["blocked"] == 1,
      );

  Map<String, dynamic> toMap() => {
        "id": id,
        "first_name": firstName,
        "last_name": lastName,
        "blocked": blocked,
      };
}

You are right
Thanks, I just updated the snippet