Error Tracking Flutter

Flutter error tracking installation - Docs

1. 1

   Install the package

   Required

   Add the PostHog Flutter SDK to your pubspec.yaml:

   pubspec.yaml

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   posthog_flutter: ^5.0.0

2. 2

   Platform setup

   Required

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   Add these values to your AndroidManifest.xml:

   android/app/src/main/AndroidManifest.xml

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   <application>
     <activity>
       [...]
     </activity>
     <meta-data android:name="com.posthog.posthog.API_KEY" android:value="<ph_project_token>" />
     <meta-data android:name="com.posthog.posthog.POSTHOG_HOST" android:value="https://us.i.posthog.com" />
     <meta-data android:name="com.posthog.posthog.TRACK_APPLICATION_LIFECYCLE_EVENTS" android:value="true" />
     <meta-data android:name="com.posthog.posthog.DEBUG" android:value="true" />
   </application>

   Update the minimum Android SDK version to 21 in android/app/build.gradle:

   android/app/build.gradle

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   defaultConfig {
     minSdkVersion 21
     // rest of your config
   }

   Tab

   Add these values to your Info.plist:

   ios/Runner/Info.plist

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   <dict>
     [...]
     <key>com.posthog.posthog.API_KEY</key>
     <string><ph_project_token></string>
     <key>com.posthog.posthog.POSTHOG_HOST</key>
     <string>https://us.i.posthog.com</string>
     <key>com.posthog.posthog.CAPTURE_APPLICATION_LIFECYCLE_EVENTS</key>
     <true/>
     <key>com.posthog.posthog.DEBUG</key>
     <true/>
   </dict>

   Update the minimum platform version to iOS 13.0 in your Podfile:

   Podfile

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   platform :ios, '13.0'
   # rest of your config

   Tab

   Add these values in index.html:

   web/index.html

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   <!DOCTYPE html>
   <html>
     <head>
       ...
       <script>
         !function(t,e){var o,n,p,r;e.__SV||(window.posthog=e,e._i=[],e.init=function(i,s,a){function g(t,e){var o=e.split(".");2==o.length&&(t=t[o[0]],e=o[1]),t[e]=function(){t.push([e].concat(Array.prototype.slice.call(arguments,0)))}}(p=t.createElement("script")).type="text/javascript",p.async=!0,p.src=s.api_host.replace(".i.posthog.com","-assets.i.posthog.com")+"/static/array.js",(r=t.getElementsByTagName("script")[0]).parentNode.insertBefore(p,r);var u=e;for(void 0!==a?u=e[a]=[]:a="posthog",u.people=u.people||[],u.toString=function(t){var e="posthog";return"posthog"!==a&&(e+="."+a),t||(e+=" (stub)"),e},u.people.toString=function(){return u.toString(1)+".people (stub)"},o="init capture register register_once register_for_session unregister opt_out_capturing has_opted_out_capturing opt_in_capturing reset isFeatureEnabled getFeatureFlag getFeatureFlagPayload reloadFeatureFlags group identify setPersonProperties setPersonPropertiesForFlags resetPersonPropertiesForFlags setGroupPropertiesForFlags resetGroupPropertiesForFlags resetGroups onFeatureFlags addFeatureFlagsHandler onSessionId getSurveys getActiveMatchingSurveys renderSurvey canRenderSurvey getNextSurveyStep".split(" "),n=0;n<o.length;n++)g(u,o[n]);e._i.push([i,s,a])},e.__SV=1)}(document,window.posthog||[]);
         posthog.init('<ph_project_token>', {
             api_host: 'https://us.i.posthog.com',
             defaults: '2026-01-30',
         })
       </script>
     </head>
     <body>
       ...
     </body>
   </html>

3. 3

   Send events

   Recommended

   Once installed, PostHog will automatically start capturing events. You can also manually send events to test your integration:

   Dart

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   import 'package:posthog_flutter/posthog_flutter.dart';
   await Posthog().capture(
       eventName: 'button_clicked',
       properties: {
         'button_name': 'signup'
       }
   );

4. 4

   Set up exception autocapture

   Recommended

   Client-side configuration only

   This configuration is client-side only. Support for remote configuration in the error tracking settings will be added in a future release.

   You can autocapture exceptions by configuring the errorTrackingConfig when setting up PostHog:

   Dart

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   final config = PostHogConfig('<ph_project_token>');
   // Enable exception autocapture
   config.errorTrackingConfig.captureFlutterErrors = true;
   config.errorTrackingConfig.capturePlatformDispatcherErrors = true;
   config.errorTrackingConfig.captureIsolateErrors = true;
   config.errorTrackingConfig.captureNativeExceptions = true;
   config.errorTrackingConfig.captureSilentFlutterErrors = false;
   await Posthog().setup(config);

   Configuration options:

   Option	Description
   captureFlutterErrors	Captures Flutter framework errors (FlutterError.onError)
   capturePlatformDispatcherErrors	Captures Dart runtime errors (PlatformDispatcher.onError). Web not supported.
   captureIsolateErrors	Captures errors from main isolate. Web not supported.
   captureNativeExceptions	Captures native exceptions (Java/Kotlin exceptions). Android only.
   captureSilentFlutterErrors	Captures Flutter errors that are marked as silent. Default: false.

5. 5

   Manually capture exceptions

   Optional

   Basic usage

   You can manually capture exceptions using the captureException method:

   Dart

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   try {
     // Your awesome code that may throw
     await someRiskyOperation();
   } catch (exception, stackTrace) {
     // Capture the exception with PostHog
     await Posthog().captureException(
       error: exception,
       stackTrace: stackTrace,
       properties: {
         'user_action': 'button_press',
         'feature_name': 'data_sync',
       },
     );
   }

   This is helpful if you've built your own error handling logic or want to capture exceptions that are handled by your application code.

   Error tracking configuration

   You can configure error tracking behavior when setting up PostHog:

   Flutter web apps use minified stack trace frames

   Flutter web apps generate minified stack trace frames by default, which may cause the configurations below to behave differently or not work as expected.

   Dart

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   final config = PostHogConfig('<ph_project_token>');
   // Configure error tracking
   config.errorTrackingConfig.inAppIncludes.add('package:your_app');
   config.errorTrackingConfig.inAppExcludes.add('package:third_party_lib');
   config.errorTrackingConfig.inAppByDefault = true;
   await Posthog().setup(config);

   Configuration options:

   Option	Description
   inAppIncludes	List of package names to be considered inApp frames (takes precedence over excludes)
   inAppExcludes	List of package names to be excluded from inApp frames
   inAppByDefault	Whether frames are considered inApp by default when their origin cannot be determined

   inApp frames are stack trace frames that belong to your application code (as opposed to third-party libraries or system code). These are highlighted in the PostHog error tracking interface to help you focus on the relevant parts of the stack trace.

6. 6

   Future features

   Optional

   We currently don't support the following features:

   • No de-obfuscating stacktraces from obfuscated builds (--obfuscate and --split-debug-info) for Dart code

   • No de-obfuscating stacktraces when isMinifyEnabled is enabled for Java/Kotlin code

   • No Source code context associated with an exception

   • No native iOS exception capture

   • No native C/C++ exception capture on Android (Java/Kotlin only)

   • No background isolate error capture

   These features will be added in future releases. We recommend you stay up to date with the latest version of the PostHog Flutter SDK.

7. Verify error tracking

   Recommended

   Confirm events are being sent to PostHog

   Before proceeding, let's make sure exception events are being captured and sent to PostHog. You should see events appear in the activity feed.

   Image: Activity feed with eventsImage: Activity feed with events

   Check for exceptions in PostHog

8. 7

   Upload source maps

   Required

   Great, you're capturing exceptions! If you serve minified bundles, the next step is to upload source maps to generate accurate stack traces.

   Let's continue to the next section.

   Upload source maps

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