Как да извлечете данните от файл json в flutter

Примерен код

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как да извлечете данните от файл json в flutter

import 'dart:convert';

main() {
  String jsonS = """{
    "stream": {
        "tv": [{
            "name": "Tv",
            "description": "Tv",
            "url": "this is the url",
            "image": "imagelink"

        }]
    }
}""";
  var myMap = json.decode(jsonS);
  var myName = myMap['stream']['tv'][0]['name'];
  print('${myName}');
}

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