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To retrieve a JSON object that includes an array in Flutter, you can use the dart:convert library to convert the JSON string to a Dart object, and then access the array in the object using the square bracket notation.

Here's an example of how to retrieve a JSON object that includes an array:

import 'dart:convert';

final response = await http.get(Uri.parse('https://example.com/json'));
if (response.statusCode == 200) {
  final jsonString = response.body;
  final jsonMap = json.decode(jsonString);
  final jsonArray = jsonMap['array'];
  print(jsonArray);
} else {
  throw Exception('Failed to load data');
}

In this example, we use the http package to make an HTTP request to fetch the JSON data. Once we get the response, we check the status code to ensure that the request was successful. Then, we decode the JSON string using json.decode() and store the resulting map in jsonMap. Finally, we access the array in the map using jsonMap['array'] and print it to the console.

Note that in this example, we assume that the JSON object includes an array with the key array. You'll need to replace this key with the one that corresponds to the array in your own JSON data.