Web session replay installation

1

Install the package

Required

Install the PostHog JavaScript library using your package manager:

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

2

Initialize PostHog

Required

Import and initialize the PostHog library with your project API key and host:

JavaScript
import posthog from 'posthog-js'

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

3
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 →

4

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

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