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Terminate the Flutter app immediately.


Panic screenshots

Supported platforms

Current Build Status. Panic is released under the MIT license. Effective Dart PRs welcome!

Content #

Features #

Panics a Flutter app.

This allows a flutter app to terminate immediately and provide feedback to the caller of the app. Panic should be used when an app reaches an unrecoverable state.

Requirements #

  • Dart: 2.14.0+
  • Flutter : 2.5.0+

Install #

  panic: ^0.0.1

Example #

  1. Add GlobalKey<NavigatorState>() to MaterialApp widget.
// `appKey` should be globally accessible in an app.
final appKey = GlobalKey<NavigatorState>();

class App extends StatelessWidget {
  const App({Key? key}) : super(key: key);

  Widget build(BuildContext context) {
    return MaterialApp(
      navigatorKey: appKey,
      home: Home(),

  1. Initialized Panic.
import 'package:panic/panic.dart';
// `panic` should be globally accessible in an app
final panic = Panic(appKey);
  1. Panic a flutter app when you really need it.
  static Future<Result<DiscoverResponse?, NetworkError>> fetchDiscover() async {
    final response = await _client.get(

    if (response.statusCode == 200) {
      // Panic app if some important parameters are missed e.g.,
      // some field in a Header or in a Body.
      if (!response.headers.containsKey('MY MISSING KEY')) {;
      return Success(DiscoverResponse.fromJson(response.body));
    } else {
      throw NetworkError(response.statusCode);

To see examples of the following package on a device or simulator:

cd example && flutter run

Support #

Post issues and feature requests on the GitHub issue tracker.

License #

The source code of Panic project is available under the MIT license. See the LICENSE file for more info.