class User { final String id; final String fullName; final String email; final String userRole; User({this.id, this.fullName, this.email, this.userRole}); User.fromData(Map data) : id = data['id'], fullName = data['fullName'], email = data['email'], userRole = data['userRole']; Map toJson() { return { 'id': id, 'fullName': fullName, 'email': email, 'userRole': userRole, }; } }