Astro web analytics installation

  1. Create the PostHog component

    Required

    In your src/components folder, create a posthog.astro file:

    Terminal
    cd ./src/components
    # or 'cd ./src && mkdir components && cd ./components' if your components folder doesn't exist
    touch posthog.astro

    In this file, add your PostHog web snippet. Be sure to include the is:inline directive to prevent Astro from processing it:

    src/components/posthog.astro
    ---
    // src/components/posthog.astro
    ---
    <script is:inline>
        !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>

  2. Create a layout

    Required

    Create a layout where we will use posthog.astro. Create a new file PostHogLayout.astro in your src/layouts folder:

    Terminal
    cd ./src/layouts
    # or 'cd ./src && mkdir layouts && cd ./layouts' if your layouts folder doesn't exist
    touch PostHogLayout.astro

    Add the following code to PostHogLayout.astro:

    src/layouts/PostHogLayout.astro
    ---
    import PostHog from '../components/posthog.astro'
    ---
    <head>
        <PostHog />
    </head>

  3. Use the layout in your pages

    Required

    Update your pages (like index.astro) to wrap your app with the new layout:

    src/pages/index.astro
    ---
    import PostHogLayout from '../layouts/PostHogLayout.astro';
    ---
    <PostHogLayout>
      <!-- your existing app components -->
    </PostHogLayout>

  4. Send events

    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' })

  5. 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.

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