Advanced error handler and logger for dart and flutter apps

Log your app actions, catch and handle exceptions and errors, show alerts and share log reports
Show some ❤️ and star the repo to support the project!

For better understanding how it works check Web Demo page

Motivation

🚀  The main goal of the project is provide ability to understand where the error occurs in a shortest possible time
✅  Compatible with any state managements
✅  Works with any crash reporting tool (Firebase Crashlytics, Sentry, custom tools, etc.)
✅  Logs UI output of Flutter app on the screen
✅  Allows sharing and saving logs history and error crash reports
✅  Displays alerts for UI exceptions.
✅  Built-in support for dio HTTP logs
✅  Built-in support for BLoC logs
✅  Built-in support for Riverpod logs
✅  Check all features

Packages

Talker is designed for any level of customization.

Package	Version	Description
talker		Main dart package for logging and error handling
talker_flutter		Flutter extensions for talker Colored Flutter app logs (iOS and Android), logs list screen, showing error messages at UI out of the box, route observer, etc
talker_logger		Customizable pretty logger for dart/flutter apps
talker_dio_logger		Best logger for dio http calls
talker_bloc_logger		Best logger for BLoC state management library
talker_riverpod_logger		Best logger for Riverpod state management library
talker_http_logger		Best logger for http package

Table of contents

• Motivation
• Packages
• Talker
  • Get Started
  • Customization
    • Custom logs
    • Change log colors
    • Change log titles
  • TalkerObserver
• Talker Flutter
  • Get Started
  • TalkerScreen
  • Customization
    • How to set custom color?
    • TalkerScreenTheme
  • TalkerRouteObserver
    • Navigator
    • auto_route
    • auto_route v7
    • go_router
  • TalkerMonitor
  • TalkerWrapper
  • More Features And Examples
• Integrations
• Talker Dio Logger
  • Customization
    • Off/On http request or reposnse logs
    • Change http logs colors
    • Filter http logs
  • Using with Talker
• Talker BLoC Logger
  • Customization
    • Off/on events, transitions, changes, creation, close
    • Full/truncated state and event data
    • Filter bloc logs
  • Using with Talker
• Talker Riverpod Logger
  • Customization
    • Off/on events, add, update, dispose, fail
    • Full/truncated state data
    • Filter riverpod logs
  • Using with Talker
• Crashlytics integration
• Features list
• Coverage
• Additional information
• Contributors

Talker

Get Started

Follow these steps to the coolest experience in error handling

Add dependency

dependencies:
  talker: ^4.5.1

Easy to use

You can use Talker instance everywhere in your app
Simple and concise syntax will help you with this

  import 'package:talker/talker.dart';

  final talker = Talker();

  /// Just logs
  talker.warning('The pizza is over 😥');
  talker.debug('Thinking about order new one 🤔');

  // Handling Exception's and Error's
  try {
    throw Exception('The restaurant is closed ❌');
  } catch (e, st) {
    talker.handle(e, st);
  }

  /// Just logs
  talker.info('Ordering from other restaurant...');
  talker.info('Payment started...');
  talker.good('Payment completed. Waiting for pizza 🍕');

More examples you can get there

⚙️ Customization

Configure the error handler and logger for yourself

final talker = Talker(
    settings: const TalkerSettings(
      /// You can enable/disable all talker processes with this field
      enabled: true,
      /// You can enable/disable saving logs data in history
      useHistory: true,
      /// Length of history that saving logs data
      maxHistoryItems: 100,
      /// You can enable/disable console logs
      useConsoleLogs: true,
    ),
    /// Setup your implementation of logger
    logger: TalkerLogger(),
    ///etc...
  );

More examples you can get here

Custom logs

With Talker you can create your custom log message types.
And you have full customization control over them!

class YourCustomLog extends TalkerLog {
  YourCustomLog(String message) : super(message);

  @override
  String get title => 'Custom';

  @override
  String? get key => 'custom_log_key';

  @override
  AnsiPen get pen => AnsiPen()..xterm(121);
}

final talker = Talker();
talker.logCustom(YourCustomLog('Something like your own service message'));

Change log colors

Starting from version 4.0.0, you have the ability to fully customize all logs colors. You can set your own color for any type of logs. For example, you can choose red for HTTP responses and green for errors—whatever suits your preference 😁

The map is now structured as {String: AnsiPen}.

String Key

The String key serves as an identifier for a specific log type (e.g., HTTP, error, info, etc.).

• Default log types are accessible via the key field in the TalkerLogType enum.
• Developers can also define custom log pen by providing their own string keys, like 'custom_log_key'.

final talker = Talker(
  settings: TalkerSettings(
    colors: {
      TalkerLogType.httpResponse.key: AnsiPen()..red(),
      TalkerLogType.error.key: AnsiPen()..green(),
      'custom_log_key': AnsiPen()..yellow(),
      // Other colors...
    },
  ),
);

Talker have default color scheme. You can check it in TalkerSettings class

Change log titles

Starting from version 4.0.0, you have the ability to fully customize all logs titles. You can set your own title for any type of logs.

The map is now structured as {String: AnsiPen}.

String Key

The String key serves as an identifier for a specific log type (e.g., HTTP, error, info, etc.).

• Default log types are accessible via the key field in the TalkerLogType enum.
• Developers can also define custom log title by providing their own string keys, like 'custom_log_key'.

final talker = Talker(
  settings: TalkerSettings(
    titles: {
      TalkerLogType.exception.key: 'Whatever you want',
      TalkerLogType.error.key: 'E',
      TalkerLogType.info.key: 'i',
      'custom_log_key': 'New custom title',
      // Other titles...
    },
  ),
);

Talker have default titles scheme. You can check it in TalkerSettings class

TalkerObserver

TalkerObserver is a mechanism that allows observing what is happening inside Talker from the outside.

import 'package:talker/talker.dart';

class ExampleTalkerObserver extends TalkerObserver {
  ExampleTalkerObserver();

  @override
  void onError(TalkerError err) {
    /// Send data to your error tracking system like Sentry or backend
    super.onError(err);
  }

  @override
  void onException(TalkerException exception) {
    /// Send Exception to your error tracking system like Sentry or backend
    super.onException(exception);
  }

  @override
  void onLog(TalkerDataInterface log) {
    /// Send log message to Grafana or backend
    super.onLog(log);
  }
}

final observer = ExampleTalkerObserver();
final talker = Talker(observer: observer);

You can use it to transmit data about logs to external sources such as Crashlytics, Sentry, Grafana, or your own analytics service, etc.

Talker Flutter

Get Started Flutter

Talker Flutter is an extension for the Dart Talker package that adds extra functionality to make it easier for you to handle logs, errors, and exceptions in your Flutter applications.

Add dependency

dependencies:
  talker_flutter: ^4.5.1

Setup

import 'package:talker_flutter/talker_flutter.dart';

final talker = TalkerFlutter.init();

// Handle exceptions and errors
try {
  // your code...
} catch (e, st) {
    talker.handle(e, st, 'Exception with');
}

// Log your app info
talker.info('App is started');
talker.critical('❌ Houston, we have a problem!');
talker.error('🚨 The service is not available');

❗️ Log messages integrity

Most of flutter logging packages either cut messages in the console, or cant dope colored messages in the iOS console. But Talker is not one of them...

Talker uses the optimal method for logging depending on the Operating system on which it runs

But to do this, you need to use the initialization given in the example. Only with TalkerFlutter.init()

As result of this method you will get the same instance of Talker as when creating it through the Talker() constructor but with logging default initialization

TalkerScreen

Often you need to check what happening in the application when there is no console at hand.
There is a TalkerScreen widget from talker_flutter package for this situations.

For better understanding how it works check Web Demo page

TalkerScreen	TalkerFilter	TalkerActions	TalkerSettings

Easy to use

You can use TalkerScreen everywhere in your app
At Screen, BottomSheet, ModalDialog, etc...

import 'package:talker_flutter/talker_flutter.dart';

final talker = TalkerFlutter.init();

Navigator.of(context).push(
  MaterialPageRoute(
    builder: (context) => TalkerScreen(talker: talker),
  )
);

See more in TalkerScreen usage example

Customization

Starting from version 4.0.0, you have the ability to fully customize your TalkerScreen display. You can set your own color for any type of logs. For example, you can choose red for HTTP responses and green for errors—whatever suits your preference 😁

How to set custom colors ?

To set your custom colors, you need to pass a TalkerScreenTheme object to the TalkerScreen constructor, with a Map containing the desired colors.

The Map is structured as {log type: color}. TalkerLogType is an identifier for a specific log type (e.g., HTTP, error, info, etc.), and each log type in Talker has its own field in the enum.

import 'package:talker_flutter/talker_flutter.dart';

final talker = TalkerFlutter.init();

TalkerScreen(
  talker: talker,
  theme: const TalkerScreenTheme(
    /// Your custom log colors
    logColors: {
      TalkerLogType.httpResponse.key: Color(0xFF26FF3C),
      TalkerLogType.error.key: Colors.redAccent,
      TalkerLogType.info.key: Color.fromARGB(255, 0, 255, 247),
      YourCustomLog.logKey: Colors.green,
    },
  )
)

TalkerScreenTheme

You can set custom backagroud, card and text colors for TalkerScreen with TalkerScreenTheme

TalkerScreenTheme(
  cardColor: Colors.grey[700]!,
  backgroundColor: Colors.grey[800]!,
  textColor: Colors.white,
  logColors: {
    /// Your logs colors...
  },
)

TalkerRouteObserver

Observer for a navigator.
If you want to keep a record of page transitions in your application, you've found what you're looking for.

You can use TalkerRouteObserver with any routing package
From auto_route to basic Flutter Navigator

Navigator

final talker = Talker();

MaterialApp(
  navigatorObservers: [
    TalkerRouteObserver(talker),
  ],
)

auto_route

final talker = Talker();

MaterialApp.router(
  routerDelegate: AutoRouterDelegate(
    appRouter,
    navigatorObservers: () => [
      TalkerRouteObserver(talker),
    ],
  ),
),

auto_route v7

final talker = Talker();

MaterialApp.router(
  routerConfig: _appRouter.config(
    navigatorObservers: () => [
      TalkerRouteObserver(talker),
    ],
  ),
),

go_router

final talker = Talker();

GoRouter(
  observers: [TalkerRouteObserver(talker)],
)

TalkerMonitor

If you want to check the status of your application in a short time
TalkerMonitor will be the best solution for you

Monitor is a filtered quick information about http requests, exceptions, errors, warnings, etc... count

You will find Monitor at the TalkerScreen page

For better understanding how it works check Web Demo page

TalkerWrapper

In addition talker_flutter is able to show default and custom error messages and another status messages via TalkerWrapper

import 'package:talker_flutter/talker_flutter.dart';

final talker = TalkerFlutter.init();

TalkerWrapper(
  talker: talker,
  options: const TalkerWrapperOptions(
    enableErrorAlerts: true,
  ),
  child: /// Application or the screen where you need to show messages
),

More Features And Examples

Custom UI error messages

In order to understand in more details - you can check this article "Showing Flutter custom error messages"

TalkerWrapper usage example

ShopApp example

See full application example with BLoC and navigation here

The talker_flutter package have a lot of another widgets like TalkerBuilder, TalkerListener, etc. You can find all of them in code documentation.

Integrations

In addition to the basic functionality, talker was conceived as a tool for creating lightweight loggers for the main activities of your application

You can use ready out of the box packages like talker_dio_logger, talker_bloc_logger and talker_riverpod_logger or create your own packages.

Talker Dio Logger

Lightweight, simple and pretty solution for logging if your app use dio as http-client

This is how the logs of your http requests will look in the console

Getting started

Follow these steps to use this package

Add dependency

dependencies:
  talker_dio_logger: ^4.5.1

Usage

Just add TalkerDioLogger to your dio instance and it will work

final dio = Dio();
dio.interceptors.add(
    TalkerDioLogger(
        settings: const TalkerDioLoggerSettings(
          printRequestHeaders: true,
          printResponseHeaders: true,
          printResponseMessage: true,
        ),
    ),
);

Customization

To provide hight usage exp here are a lot of settings and customization fields in TalkerDioLoggerSettings. You can setup all wat you want. For example:

Off/on http request or reposnse logs

You can toggle reponse / request printing and headers including

final dio = Dio();
dio.interceptors.add(
    TalkerDioLogger(
        settings: const TalkerDioLoggerSettings(
          // All http responses enabled for console logging
          printResponseData: true,
          // All http requests disabled for console logging
          printRequestData: false,
          // Reposnse logs including http - headers
          printResponseHeaders: true,
          // Request logs without http - headersa
          printRequestHeaders: false,
        ),
    ),
);

Change http logs colors

Setup your custom http-log colors. You can set color for requests, responses and errors in TalkerDioLoggerSettings

TalkerDioLoggerSettings(
  // Blue http requests logs in console
  requestPen: AnsiPen()..blue(),
  // Green http responses logs in console
  responsePen: AnsiPen()..green(),
  // Error http logs in console
  errorPen: AnsiPen()..red(),
);

Filter http logs

For example if your app has a private functionality and you don't need to store this functionality logs in talker - you can use filters

TalkerDioLoggerSettings(
  // All http request without "/secure" in path will be printed in console 
  requestFilter: (RequestOptions options) => !options.path.contains('/secure'),
  // All http responses with status codes different than 301 will be printed in console 
  responseFilter: (response) => response.statusCode != 301,
)

Using with Talker

You can add your talker instance for TalkerDioLogger if your app already uses Talker. In this case, all logs and errors will fall into your unified tracking system

final talker = Talker();
final dio = Dio();
dio.interceptors.add(TalkerDioLogger(talker: talker));

Talker BLoC Logger

Lightweight, simple and pretty solution for logging if your app use BLoC as state management

This is how the logs of your BLoC's event calling and state emits will look in the console

Getting started

Follow these steps to use this package

Add dependency

dependencies:
  talker_bloc_logger: ^4.5.1

Usage

Just set TalkerBlocObserver as Bloc.observer field and it will work

import 'package:talker_bloc_observer/talker_bloc_observer.dart';

Bloc.observer = TalkerBlocObserver();

Customization

To provide hight usage exp here are a lot of settings and customization fields in TalkerBlocLoggerSettings. You can setup all wat you want. For example:

Off/on events, transitions, changes, creation, close

You can toggle all bloc event types printing

Bloc.observer = TalkerBlocObserver(
    settings: TalkerBlocLoggerSettings(
      enabled: true,
      printChanges: true,
      printClosings: true,
      printCreations: true,
      printEvents: true,
      printTransitions: true,
    ),
  );

Full/truncated state and event data

You can choose to have the logs of events and states in the BLoC displayed in the console in either full or truncated form

Bloc.observer = TalkerBlocObserver(
    settings: TalkerBlocLoggerSettings(
      printEventFullData: false,
      printStateFullData: false,
    ),
  );

Filter bloc logs

You can output logs to the console for specific events and states only, using a filter

Bloc.observer = TalkerBlocObserver(
    settings: TalkerBlocLoggerSettings(
      // If you want log only AuthBloc transitions
      transitionFilter: (bloc, transition) =>
          bloc.runtimeType.toString() == 'AuthBloc',
      // If you want log only AuthBloc events
      eventFilter: (bloc, event) => bloc.runtimeType.toString() == 'AuthBloc',
    ),
  );

Using with Talker!

You can add your talker instance for TalkerBlocLogger if your Appication already uses Talker.

In this case, all logs and errors will fall into your unified tracking system

import 'package:talker_bloc_observer/talker_bloc_observer.dart';
import 'package:talker/talker.dart';

final talker = Talker();
Bloc.observer = TalkerBlocObserver(talker: talker);

Talker Riverpod Logger

Lightweight, simple and pretty solution for logging if your app use Riverpod as state management

This is how the logs of your Riverpod's event calling and state emits will look in the console

Getting started

Follow these steps to use this package

Add dependency

dependencies:
  talker_riverpod_logger: ^4.5.1

Usage

Just pass TalkerRiverpodObserver to either ProviderScope or ProviderContainer and it will work

import 'package:talker_riverpod_observer/talker_riverpod_observer.dart';

runApp(
  ProviderScope(
    observers: [
      TalkerRiverpodObserver(),
    ],
    child: MyApp(),
  )
);

or

import 'package:talker_riverpod_observer/talker_riverpod_observer.dart';

final container = ProviderContainer(
  observers: [
    TalkerRiverpodObserver(),
  ],
);

Customization

To provide hight usage exp here are a lot of settings and customization fields in TalkerRiverpodLoggerSettings. You can setup all wat you want. For example:

Off/on events, add, update, dispose, fail

You can toggle all riverpod event types printing

TalkerRiverpodObserver(
  settings: TalkerRiverpodLoggerSettings(
    enabled: true,
    printProviderAdded: true,
    printProviderUpdated: true,
    printProviderDisposed: true,
    printProviderFailed: true,
  ),
)

Full/truncated state data

You can choose to have the logs of states in the Riverpod displayed in the console in either full or truncated form

TalkerRiverpodObserver(
  settings: TalkerRiverpodLoggerSettings(
    printStateFullData: false,
  ),
)

Filter Riverpod logs

You can output logs to the console for specific events only, using a filter

TalkerRiverpodObserver(
  settings: TalkerRiverpodLoggerSettings(
    // If you want log only AuthProvider events
      eventFilter: (provider) => provider.runtimeType == 'AuthProvider<User>',
  ),
)

Using with Talker!

You can add your talker instance for TalkerRiverpodLogger if your Appication already uses Talker.

In this case, all logs and errors will fall into your unified tracking system

import 'package:talker_riverpod_observer/talker_riverpod_observer.dart';
import 'package:talker/talker.dart';

final talker = Talker();

runApp(
  ProviderScope(
    observers: [
      TalkerRiverpodObserver(
        talker: talker,
      ),
    ],
    child: MyApp(),
  )
);

or

import 'package:talker_riverpod_observer/talker_riverpod_observer.dart';
import 'package:talker/talker.dart';

final talker = Talker();

final container = ProviderContainer(
  observers: [
    TalkerRiverpodObserver(
      talker: talker,
    ),
  ],
);

Crashlytics integration

If you add CrashlyticsTalkerObserver to your application, you will receive notifications about all application errors in the Crashlytics dashboard.

Additionally, you can configure it to send only specific errors to Crashlytics from within TalkerObserver.

import 'package:firebase_crashlytics/firebase_crashlytics.dart';
import 'package:talker/talker.dart';

class CrashlyticsTalkerObserver extends TalkerObserver {
  CrashlyticsTalkerObserver();

  @override
  void onError(err) {
      FirebaseCrashlytics.instance.recordError(
        err.error,
        err.stackTrace,
        reason: err.message,
      );
  }

  @override
  void onException(err) {
      FirebaseCrashlytics.instance.recordError(
        err.exception,
        err.stackTrace,
        reason: err.message,
      );
  }
}

final crashlyticsTalkerObserver = CrashlyticsTalkerObserver();
final talker = Talker(observer: crashlyticsTalkerObserver);

Features list

✅ Logging

• ✅ Filtering

• ✅ Formatting

• ✅ Color logs

• ✅ LogLevels (info, verbose, warning, debug, error, critical, fine, good)

• ✅ Customization for filtering, formatting and colors

• 🚧 Separation from system's and another flutter logs

• 🚧 Collapsible feature for huge logs

• 🚧 Logs grouping

✅ Errors handling

• ✅ Errors and Exceptions identification
• ✅ StackTrace
• 🚧 Error level identification

✅ Flutter

• ✅ Application logs sharing

• ✅ HTTP cals logging

• ✅ TalkerScreen - Showing logs list in Flutter app UI

• ✅ TalkerMonitor - A short summary of your application status. How much errors, how much warnings in Flutter app UI

• ✅ TalkerRouteObserver - router logging (which screen is opened, which is closed)

• ✅ TalkerWrapper - Showing errors and exceptions messages at UI

• ✅ TalkerListener - Listen logs data at application UI

• ✅ TalkerBuilder - UI builder to Logs List showing custom UI

• ✅ Android/Windows/Web application logs colors

• ✅ iOS/MacOS application logs colors

• ✅ Talker configuration chnages from TalkerFlutter

✅ Logs and errors history saving

✅ TalkerObserver - handle all logs, errors, exceptions for integrations (Sentry, Crashlytics)

Coverage

Error handling is a very important task
You need to choose carefully if you want to use a package for exceptions handling solution
Therefore, the project is 100% covered by tests

Additional information

The project is under development and ready for your pull-requests and issues 👍
Thank you for support ❤️

Contributors

For help getting started with 😍 Flutter, view online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.