Setting the file. One moment.
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.
Chapter 158 · Omnibus Instrument Error Tracking
Subchapter 158.20
references/web.mdMarkdown5 KBView on GitHub
Required
You can either add the JavaScript snippet directly to your HTML or install the JavaScript SDK via your package manager.
Add this snippet to your website within the <head> tag. This can also be used in services like Google Tag Manager:
HTML
PostHog AI
<script>
!function(t,e){var o,n,p,r;e.__SV||(window.posthog && window.posthog.__loaded)||(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.crossOrigin="anonymous",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 os ds Ie us vs ss ls capture calculateEventProperties register register_once register_for_session unregister unregister_for_session ws getFeatureFlag getFeatureFlagPayload getFeatureFlagResult isFeatureEnabled reloadFeatureFlags updateFlags updateEarlyAccessFeatureEnrollment getEarlyAccessFeatures on onFeatureFlags onSurveysLoaded onSessionId getSurveys getActiveMatchingSurveys renderSurvey displaySurvey cancelPendingSurvey canRenderSurvey canRenderSurveyAsync identify setPersonProperties group resetGroups setPersonPropertiesForFlags resetPersonPropertiesForFlags setGroupPropertiesForFlags resetGroupPropertiesForFlags reset get_distinct_id getGroups get_session_id get_session_replay_url alias set_config startSessionRecording stopSessionRecording sessionRecordingStarted captureException startExceptionAutocapture stopExceptionAutocapture loadToolbar get_property getSessionProperty bs ps createPersonProfile setInternalOrTestUser ys es $s opt_in_capturing opt_out_capturing has_opted_in_capturing has_opted_out_capturing get_explicit_consent_status is_capturing clear_opt_in_out_capturing cs debug M gs getPageViewId captureTraceFeedback captureTraceMetric Qr".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>Install the PostHog JavaScript library using your package manager. Then, import and initialize the PostHog library with your project token and host:
PostHog AI
npm install posthog-jsyarn add posthog-jspnpm add posthog-jsJavaScript
PostHog AI
import posthog from 'posthog-js'
posthog.init('<ph_project_token>', {
api_host: 'https://us.i.posthog.com',
defaults: '2026-01-30'
})2
Recommended
Once installed, PostHog will automatically start capturing events. You can also manually send events to test your integration:
Click around and view a couple pages to generate some events. PostHog automatically captures pageviews, clicks, and other interactions for you.
If you’d like, you can also manually capture custom events:
JavaScript
PostHog AI
posthog.capture('my_custom_event', { property: 'value' })3
Recommended
You can enable exception autocapture for the JavaScript Web SDK in the Error tracking section of your project settings (opens in a new tab).
When enabled, this automatically captures $exception events when errors are thrown by wrapping the window.onerror and window.onunhandledrejection listeners.
4
Optional
It is also possible to manually capture exceptions using the captureException method:
JavaScript
PostHog AI
posthog.captureException(error, additionalProperties)This is helpful if you’ve built your own error handling logic or want to capture exceptions that are handled by your application code.
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.
5
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.
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