Exception: type 'String' is not a subtype of type 'Map<String, dynamic>

Question

Exception: type 'String' is not a subtype of type 'Map<String, dynamic>'

{"collection":{"data":"{\"id\": 1, \"name\": \"Marko\", \"picture\": 
\"https://lh3.googleusercontent.com/a-/AAuE7mC1vqaKk_Eylt-fcKgJxuN96yQ7dsd2dBdsdsViK959TKsHQ=s96- 
c\"}","statusCode":202,"version":"1.0"}}

This is the above json and i want to put it at User pojo class only the [data].

But it threw the above exception type.

class UserCollection {
  final User data;
  final int statusCode;
  final String version;

 UserCollection({this.data, this.statusCode, this.version});

factory UserCollection.fromJson(Map<String, dynamic> json) {
 return UserCollection(
    statusCode: json['statusCode'] as int,
    data: User.fromJson(json['data']) ,
    version: json['version'] as String );
}

 Map<String, dynamic> toJson() {
 final Map<String, dynamic> data = new Map<String, dynamic>();
 data['data'] = this.data;
 data['statusCode'] = this.statusCode;
 data['version'] = this.version;
 return data;
 }
}

User Pojo class

@JsonSerializable()
class User {
final int id;
 final String sub;
 final String home;
 final String work;
 final String name;
 final String mobileNo;
 final String email;
 final String favMechId;
 final String appVersionCode;
 final String picture;
 final String serverTime;
 final String dateCreated;
 final String dateModified;
 final String fcmTokenId;

 User(
  {this.id,
  this.sub,
  this.home,
  this.work,
  this.name,
  this.mobileNo,
  this.email,
  this.favMechId,
  this.appVersionCode,
  this.picture,
  this.serverTime,
  this.dateCreated,
  this.dateModified,
  this.fcmTokenId});



  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);

  Map<String,dynamic> toJson() => _$UserToJson(this);

I have referring this medium site for clarity, medium flutter json

but in vein more than 4 hours i couldn't what was wrong. If change the User.from() to String then it's okay. But i need to parse the [data] from json to User pojo class.

I didn't get it. The POJO in Java, isn't it PODO in dart? This is what i read everywhere. — Maz341
– Maz341, Commented Oct 22, 2020 at 5:00

Sagar Zala · Accepted Answer · 2020-03-12 06:33:04Z

20

Try below,

factory UserCollection.fromJson(Map<String, dynamic> json) {
 return UserCollection(
    statusCode: json['statusCode'] as int,
    data: User.fromJson(json.decode(json['data'])),
    version: json['version'] as String );
}

Change in data: User.fromJson(json.decode(json['data'])),

answered Mar 12, 2020 at 6:33

Sagar Zala

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3 Comments

yogithesymbian Over a year ago

how to know the line of error ? because a lot of json to dart ? have 400 lines with many children sub children json . how to debug thats mean to need added json.decode ? because json.decode is no method , i use jsonDecode() instead . but not work.

Amina Bekir Over a year ago

you should change "json" parameter name, cos it makes a problem while using "json.decode."

Muhammad Faisal Over a year ago

@YogiArifWidodo try to use jsonDecode(source) instead

Mustafa Tameemi · Accepted Answer · 2023-09-07 17:58:54Z

2

Well, I solved this issue by decoding whole 'response' before using .fromJson

answered Sep 7, 2023 at 17:58

Mustafa Tameemi

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Comments

Rahul Kumar Tiwari · Accepted Answer · 2024-04-26 13:20:52Z

0

In this case, you have to check the API response also. If it's returning a string convert to array.

return response()->json('Updated sucessfully !', 200);

Replace with

return response()->json(['message' => 'Updated sucessfully !', 200);

answered Apr 26, 2024 at 13:20

Rahul Kumar Tiwari

1473 bronze badges

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