```dart
Future<void> postTodo() async {
  try {
    final restOperation = Amplify.API.post(
      'todo',
      body: HttpPayload.json({'name': 'Mow the lawn'}),
    );
    final response = await restOperation.response;
    print('POST call succeeded');
    print(response.decodeBody());
  } on ApiException catch (e) {
    print('POST call failed: $e');
  }
}
```