Web error tracking installation

Choose an installation method

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
<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>

Install the PostHog JavaScript library using your package manager. Then, import and initialize the PostHog library with your project token and host:

npm install posthog-js
yarn add posthog-js
pnpm add posthog-js

JavaScript
import posthog from 'posthog-js'

posthog.init('<ph_project_token>', {
    api_host: 'https://us.i.posthog.com',
    defaults: '2026-01-30'
})

2
Send events
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.capture('my_custom_event', { property: 'value' })
3
Set up exception autocapture
Recommended
You can enable exception autocapture for the JavaScript Web SDK in the Error tracking section of your project settings.

When enabled, this automatically captures $exception events when errors are thrown by wrapping the window.onerror and window.onunhandledrejection listeners.
4
Manually capture exceptions
Optional
It is also possible to manually capture exceptions using the captureException method:
JavaScript
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.
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.
Check for exceptions in PostHog
5
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

Web error tracking installation

Choose an installation method

Send events

Set up exception autocapture

Manually capture exceptions

Verify error tracking

Upload source maps

Community questions

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