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To convert a JSON into an object in Flutter, you can use the jsonDecode function from the dart:convert package. Here's an example code snippet:

import 'dart:convert';

class YourObject {
  // define the properties of your object here
  String name;
  int age;

  YourObject({this.name, this.age});

  factory YourObject.fromJson(Map<String, dynamic> json) {
    return YourObject(
      name: json['name'],
      age: json['age'],
    );
  }
}

void convertJsonToObject(String jsonString) {
  final Map<String, dynamic> jsonMap = jsonDecode(jsonString);
  final YourObject yourObject = YourObject.fromJson(jsonMap.cast<String, dynamic>());

  // do something with yourObject
}

In the convertJsonToObject function, we first decode the JSON string into a Map<String, dynamic> using jsonDecode. Then we create an instance of the YourObject class using the fromJson factory constructor, which takes a Map<String, dynamic> parameter. However, we need to cast the jsonMap to a Map<String, dynamic> using cast<String, dynamic>() to avoid the NoSuchMethodError error you mentioned.

Make sure to replace YourObject with the name of your own object class, and update the fromJson factory constructor to match the properties of your object.