Fetching but Type Conversion Err

lib/album_post.dart

@@ -0,0 +1,45 @@
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+
+Future<Album> createAlbum(String title) async {
+  final response = await http.post(
+    Uri.parse('https://jsonplaceholder.typicode.com/albums'),
+    headers: <String, String>{
+      'Content-Type': 'application/json; charset=UTF-8',
+    },
+    body: jsonEncode(<String, String>{
+      'title': title,
+    }),
+  );
+
+  if (response.statusCode == 201) {
+    // If the server did return a 201 CREATED response,
+    // then parse the JSON.
+    return Album.fromJson(jsonDecode(response.body) as Map<String, dynamic>);
+  } else {
+    // If the server did not return a 201 CREATED response,
+    // then throw an exception.
+    throw Exception('Failed to create album.');
+  }
+}
+
+class Album {
+  final int id;
+  final String title;
+
+  const Album({required this.id, required this.title});
+
+  factory Album.fromJson(Map<String, dynamic> json) {
+    return switch (json) {
+      {
+        'id': int id,
+        'title': String title,
+      } =>
+        Album(
+          id: id,
+          title: title,
+        ),
+      _ => throw const FormatException('Failed to load album.'),
+    };
+  }
+}