Unhandled Exception: InternalLinkedHashMap' is not a subtype of type 'List

Question

I am trying to get the JSON response from the server and output it to the console.

Future login() async {
    var response = await http.get(
            


        

Answer 1

I had the same error using json_annotation, json_serializable, build_runner. It occurs when calling the ClassName.fromJson() method for a class that had a class property (example: class User has a property class Address).

As a solution, I modified the generated *.g.dart files of each class, by changing Map) to Map) in everywhere there is a deep conversion inside the method _$*FromJson

The only problem is that you have to change it again every time you regenerate your files.