Flutter handle future response - flutter

Question

i want to store token value and navigate home page using go router after login. i dont know how to handle json data like display or (retrieve)name and role.. i am newbie for programming.
Help me.thanks in advance.i tried futurebuilder examples it not worked. kindly give simple solution.
Future<Loginuser> fetchLoginuser(String mobile, String password) async {
final response = await http.post(
Uri.parse('https://random.url/api/login'),
headers: <String, String>{
'Content-Type': 'application/json; charset=UTF-8',
},
body: jsonEncode(
<String, String>{'mobile': mobile, 'password': password}));
if (response.statusCode == 200) {
return Loginuser.fromJson(json.decode(response.body));
} else {
throw Exception('Failed to update album.');
}
}
class Userinfo {
double branchcode;
double role;
double name;
Userinfo({required this.branchcode, required this.role, required this.name});
factory Userinfo.fromJson(Map<String, dynamic> json) {
return Userinfo(
branchcode: json['branchcode'], role: json['role'], name: json['name']);
}
}
class Loginuser {
final String message;
final String messagecode;
final String token;
final Userinfo userinfo;
const Loginuser({
required this.message,
required this.messagecode,
required this.token,
required this.userinfo,
});
factory Loginuser.fromJson(Map<String, dynamic> json) {
return Loginuser(
message: json['message'],
messagecode: json['messagecode'],
token: json['token'],
userinfo: json['userinfo']);
}
}

Answer 1

Use shared_preferences usage is straight forward
here just do this
if (response.statusCode == 200) {
Loginuser _user = Loginuser.fromJson(json.decode(response.body));
final prefs = await SharedPreferences.getInstance();
await prefs.setString('token', user.token);
return user;
} else {
throw Exception('Failed to update album.');
}
And next time you want to check wether user was logged in or not
final prefs = await SharedPreferences.getInstance();
final String? action = prefs.getString('token');
if(token == null){ //not logged in}else{ //logged navigate to dashboard}
///Create a separate helper/manager for shared preferences. This is just an example///