Astro session replay installation

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_api_key>', {
        api_host: 'https://us.i.posthog.com',
        defaults: '2025-11-30'
    })
</script>

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>

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
Watch session recordings
Recommended
Visit your site or app and interact with it for at least 10 seconds to generate a recording. Navigate between pages, click buttons, and fill out forms to capture meaningful interactions.
Watch your first recording →

Next steps

Recommended

Now that you're recording sessions, continue with the resources below to learn what else Session Replay enables within the PostHog platform.

Resource	Description
Watching recordings	How to find and watch session recordings
Privacy controls	How to mask sensitive data in recordings
Network recording	How to capture network requests in recordings
Console log recording	How to capture console logs in recordings
More tutorials	Other real-world examples and use cases

Astro session replay installation

Create the PostHog component

Create a layout

Use the layout in your pages

Watch session recordings

Next steps

Community questions

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