Type String Is Not A Subtype Of Type List Dynamic In Type Cast - body, but getting " Unhandled Exception: type 'String' is not a subtype of type 'Map<String, dynamic>' in type cast " error . Object?>' is not a subtype of type 'Map<String?, dynamic>' in type cast" printed on the console. OR if it is unable to, it should throw an error to the 0 list field is a String in the DB and you're expecting it to be a List<dynamic>. url as List<dynamic> to List<dynamic>, which will throw exception in case the list is NULL which is in The full error I am getting is: The following _TypeError was thrown building FutureBuilder (dirty, state: _FutureBuilderState#03213): type 'List' is not a subtype of type 'String' The relevant List<dynamic> is not a subtype of type Map<String, dynamic> This means that the data that you are receiving after hitting a web service is in the form of a List, but the data class that Flutter List<dynamic> is not a subtype of type List<String> Ask Question Asked 4 years, 4 months ago Modified 4 years, 4 months ago this code returns me exception said: type 'List<Map<String, String>>' is not a sub type of type 'String' in type cast when I convert nested List to String like this: groceryItem. ogImage?[0]. However, the final List<Map<String, dynamic>> data = json. openbrewerydb. decode has the static type dynamic but really returns a List<dynamic> which contains Map<String, dynamic> objects. cast<String> (). 参考 cast method - List class - dart:core library - Dart API dart - type ‘List’ is not a subtype of type ‘List’ where - Stack Overflow 1 It looks like data is a List<dynamic>, then data. A fix is use List<dynamic> instead Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast #299 Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>' Asked 6 years, 10 months ago Modified 5 years, 11 months ago Viewed 11k times Map<String, dynamic> is typically the type for a json object deserialized with jsonDecode. The correct is json ['cookies']. images[index]), // Corrected The error occurs when I try to cast values different from dynamic (lists in this case). If you are still experiencing a similar issue, type 'List<dynamic>' is not a subtype of type 'List<String>' in type cast Do you have any idea to make it work? Whenever there is a dart:io import it wouldn't cast it, when I removed the import it worked. body); Because the response is not a list, it's a map. fromJson (jsonResponse); => Error! (type 'List' is not a subtype of type 'List<Map<String, dynamic>>' in type cast) I want to figure it out because Objective is to convert a String to List using map and return the value to a function call. In my sample project I implemented project with riverpod package and freezed. Down there there is the part of code where I map the Firebase document and the user model. map(someFunc). At some point you receive a String that is not deserialized or a json object when you Why do I see "type 'List<dynamic>' is not a subtype of type 'List<Binding>'" in the debug console when streaming posts from Supabase? Asked 1 year, 2 months ago Modified 1 year, Flutter type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'List<dynamic>' Asked 4 years ago Modified 3 years, 5 months ago Viewed 6k times type 'Future<String>' is not a subtype of type 'String' in type cast in flutter [duplicate] Asked 6 years, 11 months ago Modified 9 months ago Viewed 38k times Flutter type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'List<dynamic>' Asked 4 years ago Modified 3 years, 5 months ago Viewed 6k times type 'Future<String>' is not a subtype of type 'String' in type cast in flutter [duplicate] Asked 6 years, 11 months ago Modified 9 months ago Viewed 38k times Error message: type 'List<dynamic>' is not a subtype of type 'List<String>'; The issue is likely due to trying to assign a List<dynamic> to a List<String>. type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast Asked 5 years, 4 months ago Modified 5 years, 3 months ago Viewed 236 times This thread has been automatically locked since there has not been any recent activity after it was closed. I am using SharedPreferences to save a list of object called where in I save the data at a point and Flutter Error: type 'MappedListIterable<dynamic, dynamic>' is not a subtype of type 'List<dynamic>' in type cast Asked 4 years, 2 months ago Modified 3 years, 6 months ago Viewed I am trying to list the users in flutter but i am getting the error that string is not a subtype of type int in type cast. I thought the same should work with an object, inside which there is a list of In your frontend part, you're trying to cast a nullable type of list allNews[i]. So if you have a List<List<dynamic>> (not just an object o such that o is Developers often attempt to cast this dynamic list into a specific list type, such as `List `. cast<int>(); types in JSON maps or lists don't have concrete generic types. decode(response. Any idea whats causing this? 0 it seems like the issue might be with the event. The List. But those inner casts (which are like Solve the List is not a subtype of List error in Flutter with our guide. Unhandled Exception: InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'List<dynamic> Asked 7 years ago Modified 2 years, 8 months ago Viewed 303k times A comprehensive guide on understanding and fixing the common Flutter error regarding list types, specifically `List dynamic ` and `List String `. It looks like you're Please can anyone explain what's the issue with this! I am getting this error "type 'Null' is not a subtype of type 'List' in type cast" The option that does not work for me is suitable for a response from the server in the form of a single object. Dart requires explicit handling because it doesn't automatically assume that all elements in a `List ` The DropDownField is a third party Widget and it take data as List of String in its property called as "items", but I am facing this Error. 0 Error: Exception has occurred. Flutter by default will handle data types coming from underlying platform and map it to proper datatype in Dart, check this table here to see datatypes. You have to account for receiving more that one category in categories. _CastError (type 'List' is not a subtype of type 'Map<String, dynamic>' in type cast) How can i solve this problem?? Edit: With the new model class I made following an answer here I'm able to get profile model separately but when i try to get account model with all profiles I'm getting the error: type I have been trying to read Data off of Firestore, using a user data Model. Note that the discussion above refers to retype method, which was removed from Dart 2, but other Note that myList. This is expected as you indicate it should We would like to show you a description here but the site won’t allow us. List<dynamic> is not assignable to List<String> because that violate the type rules. but it my case sounds like Flutter Your CategoriesModel doesn't seem to account for receiving a List (note the [] surrounding it in the json). Parse Error: type Conclusion The List<dynamic> is not a subtype of type Map<String, dynamic> error is a common pitfall in Flutter JSON parsing, but it’s easily fixed by aligning your model class with the final List<dynamic> Json = json. runtimeType will differ: List<String> in case of a new list CastList<dynamic, String> in case of a cast See discussion on Effective Dart: When to use "as", ". "item" is a list, but that's inside the response. The solution is to provide a type argument to the map method. retype", ". Learn how to fix the common `type 'List dynamic ' is not a subtype of type 'String'` error when fetching data from APIs in Flutter. type 'List' is not a subtype of type 'FutureOr' Seems this is a somewhat common error but I've yet to find a solution to this particular use case from the actual flutter example code. Have you checked the line the generate fromJson method is wrong. If you change this to factory UserResponseModel. I want to get user model after registration is completed with firebase email auth. toList() will take each element of data pass it to someFunc Unhandled Exception: type 'String' is not a subtype of type 'List<dynamic>' in type cast Asked 4 years ago Modified 4 years ago Viewed 3k times The DIO response data property is a Map<String, dynamic> as indicated by the error message and you are trying to cast it into List<dynamic>. from constructor will create a new list, and it will get the type argument String because it's being returned and the return type is List<String> One thing you need to take into account is that List<List<dynamic>> is not a subtype of List<List<num>>. In the MarsatmasResponseModel, when you bring the data with an id of List type, Marsatmas is returned. The issue was resolved by properly Type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>' Ask Question Asked 5 years, 11 months ago Modified 3 years ago This JSON, as you can see, should deserialize into List<Map<String, dynamic>>. fromJson I get _TypeError (type 'List<dynamic>' is not a subtype of type 'String?') while i tried to fetch Api data ,i got a error like above i mentioned. The problem here is that type inference fails in an unexpected way. Check data types being type List<dynamic> is not a subtype of type FutrueOr<ListCity>> Data is received like below: Map<String, dynamic> messageList = [] as Map<String, dynamic>; Its weird because i have a similar piece of code that works despite being nearly identical. I can't detect what part of the code is the causing the problem. I have upgraded to Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast #411 New issue Closed frgmt The problem is your fromMap constructor is reading from a Map<String, dynamic>, so I bet that all of the lists in that map are actually List<dynamic> or In your case body is a Map<String, dynamic> because the "params" key maps to a List<dynamic> ([]) rather than a String ("[]"). cast" I would 'List<dynamic>' is not a subtype of type 'List<Example>' I'm parsing a JSON array of JSON objects, one of the fields is a list of objects as well and I suspect my issue stems from that. Change the DB list to be an actual list and you're good to go. The problem is that you're calling the operator is and casting a value to the type List, except that this value is null, which is not a subtype of List, thus the error. This is my code to display the data from the database. org/ and converted it to Dart but the problem that I run into is when I try to decode the API I get the Flutter error: type 'int' is not a subtype of type 'String' in type cast Asked 7 years ago Modified 4 years, 1 month ago Viewed 53k times Can someone help me to fix this problem. For this I'm using EventChannel and MethodChannel. it's actually a list of dynamic objects. I get this error. i can't fetch data from json using flutter http request because it got this Unhandled Exception: type 'List' is not a subtype of type 'String' and I'm sending the JSON as string from response. However, when I attempt to get a user model from firestore, the following error is printed: type 0 I ran your code with some dummy data, the cast<String> for categories works for me. genreIds = jsonMap["genre_ids"]. In the code below, I can get data from the server successfully, but when I try to use model. Detailed steps and code examples included. fromJson(List<dynamic> json) does it work? List<dynamic>' is not a subtype of type 'List<String>' in type cast when i try to fetch data from api Ask Question Asked 2 years, 3 months ago Modified 11 months ago type List<dynamic> is not a subtype of type 'List<String>' in type cast If I just use categories = map['categories']; I get a compile error: The Developers were getting a TypeError stating that type 'List<dynamic>' is not a subtype of type 'List<String>'. genreIds requires a List<int> not a List (or List<dynamic>), therefore you What I'm trying to do is to communicate between Flutter and Android. Please Help me and make me understand where I am Flutter _TypeError type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic> Ask Question Asked 6 years, 11 months ago Modified 5 type 'Future<List<dynamic>>' is not a subtype of type 'List<String>' in type cast Asked 2 years, 4 months ago Modified 2 years, 4 months ago Viewed 113 times This thread has been automatically locked since there has not been any recent activity after it was closed. I updated flutter3 after that I get an error "type '_Map<Object?, Object?>' is not a subtype of type 'Map<String?, dynamic>' in type cast" printed on the console in final Parkings parkingList = Parkings. You’re expecting it to both coerce the map to Map<String, List<int> but also cast all of the elements to List<int>. If I read the Collection of references using a variable of CollectionReference Type and use a custom built I want to fetch by id and I get this error. tags is List<GroceryItmTag>? and I'm assigning to it, a field which is a List<GroceryItmTag>?, under the hood, even though it is not type ' () => Map<String, dynamic>?' is not a subtype of type 'Map<String, dynamic>' in type cast Asked 4 years, 6 months ago Modified 4 years, 6 months ago Viewed 7k times Unhandled Exception: type 'List' is not a subtype of type 'List' It seems like using type dynamic it will pretty much throw an error if you try to set a type annotation afterwards for any type. images field. Due to codec restrictions I need to wrap my Android data in HashMap before se Back [SOLVED] Unhandled Exception: type '_Map<String, dynamic>' is not a subtype of type 'List<dynamic>' 0 Flutter Pretty sure the input of this function cannot be a map if your api is returning a list of maps. from constructor will create a new list, and it will get the type argument String because it's being returned and the return type is List<String> Learn how to fix the 'List<Object?>' not a subtype of 'List<' error in Dart. (Obviously, in my real-life scenario, there was a reason to include it). Maybe you want to do Dart and JSON: Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast Asked 2 years, 10 months ago Modified 2 years, 10 months I took the JSON from https://www. If you are still experiencing a similar issue, I'm trying to get all the documents inside a determined collection from my firestore and after that, I want to set them in a list of documents which each position of the list represents a One is a Future, the other is a List, you probably need to use async/await/then etc to deal with the response from somewhere, but it's hard to say correctly without seeing the code :). CircleAvatar( backgroundImage: NetworkImage(event. type List<dynamic> is not a subtype of type 'List<String>' in type cast If I just use categories = map['categories']; I get a compile error: The If you’ve worked with Firestore in Dart (or Flutter), you’ve likely encountered a common frustration: retrieving a list of strings from a Firestore document only to be hit with a runtime error The List. decode(raw); line fails on runtime saying: You need to understand the difference between runtime types and static types. Learn practical solutions and examples to fix type mismatches in StreamBuilder. It try to use json ['cookies'] as List<String>, and will get a exception. However, you have not added the cast to skills and otherLanguages. It looks like you're already manually encoding body to a json string so it may be enough to surround the entire body in quotes to make it a String instead So I would only use cast or retype if my access patterns are sparse or if I needed to update the original. ctb, qtf, gos, pyb, aqr, xsq, erk, tdb, obl, hei, pzf, exn, chd, prx, pzp,