dart JSON String convert to List String

Question

I have an API that calls the json String array as follows:

[
  \"006.01.01\",
  \"006.01.01 1090\",
  \"006.01.01 1090 1090.950\",
  \"006.01.01 1090 1090.95         


        

Answer 1

Try this one. Hope it helps.

import 'dart:convert';

void main() {
  String jsonResponse = '''
    ["006.01.01",
    "006.01.01 1090",
    "006.01.01 1090 1090.950",
    "006.01.01 1090 1090.950 052",
    "006.01.01 1090 1090.950 052 A",
    "006.01.01 1090 1090.950 052 A 521219",
    "006.01.01 1090 1090.950 052 A 521219",
    "006.01.01 1090 1090.950 052 A 521219",
    "006.01.01 1090 1090.950 052 A 521219",
    "006.01.01 1090 1090.950 052 A 521219",
    "006.01.01 1090 1090.950 052 B",
    "006.01.01 1090 1090.950 052 B 521211",
    "006.01.01 1090 1090.950 052 B 521211",
    "006.01.01 1090 1090.994",
    "006.01.01 1090 1090.994 001",
    "006.01.01 1090 1090.994 001 A",
    "006.01.01 1090 1090.994 001 A 511111",
    "006.01.01 1090 1090.994 001 A 511111",
    "006.01.01 1090 1090.994 001 A 511111",
    "006.01.01 1090 1090.994 001 A 511111"]
  ''';

  dynamic jsonParsed = json.decode(jsonResponse);

//   print(jsonParsed);

  print(jsonParsed[5]);
}

Answer 2

The result of parsing a JSON list is a List<dynamic>. The return type of jsonDecode is just dynamic.

You can cast such a list to a List<String> as

List<String> stringList = (jsonDecode(input) as List<dynamic>).cast<String>();

You can also just use it as a List<dynamic> and then assign each value to String:

List<dynamic> rellyAStringList = jsonDecode(input);
for (String string in reallyAStringList) { ... }

The effect is approximately the same - each element is checked for being a string when it is taken out of the list.

Answer 3

We can easily parse the JSON into a Dart array without the need of creating any class.

main() {
  String arrayText = '{"tags": ["dart", "flutter", "json"]}';

  var tagsJson = jsonDecode(arrayText)['tags'];
  List<String> tags = tagsJson != null ? List.from(tagsJson) : null;

  print(tags);
}

Now you can see the result of printing the Dart Array.

[dart, flutter, json]