在flutter中，如何从api数据中获取单个字段

import 'package:http/http.dart' as http;

Future<String> fetchData() async {
  final response = await http.get(Uri.parse('https://api.example.com/data'));
  if (response.statusCode == 200) {
    return response.body;
  } else {
    throw Exception('Failed to fetch data');
  }
}

import 'dart:convert';

void main() async {
  try {
    final data = await fetchData();
    final parsedData = jsonDecode(data);
    final fieldValue = parsedData['fieldName'];
    print('Field value: $fieldValue');
  } catch (e) {
    print('Error: $e');
  }
}