JavaScript web analytics 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
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
Next steps
Recommended
After installing PostHog and ensuring autocapture is enabled, head to your web analytics dashboard to see your data. And then check out our getting started guide.
PostHog tip: Web analytics works with anonymous events. This means if you are primarily using PostHog for web analytics, it can be significantly cheaper for you.

JavaScript web analytics installation

Choose an installation method

Send events

Next steps

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