Get started with PostHog Debugger

Install PostHog Debugger

Install PostHog Debugger from the Chrome Web Store or Firefox Add-ons. The extension is an unofficial, local DevTools tool for inspecting how the page uses PostHog.

Open the PostHog panel

1. Open the site or environment you want to debug.
2. Open your browser DevTools.
3. Select the PostHog panel. If the DevTools tab bar is crowded, look in its overflow menu.
4. Keep DevTools open and reload the inspected page.

Reloading matters: the extension captures requests after its page hook is installed. Opening DevTools after the page already sent its startup analytics cannot recreate those earlier requests.

Capture your first activity

After the reload, open Config to confirm the page exposes PostHog configuration, then use Events to inspect decoded events as you reproduce a flow. Select an event to review its properties, warnings, and raw JSON. Use the toolbar to pause or clear the in-memory capture when you need a clean run.

If you expect an event but do not see it, first check that capture is not paused and that Events filters are not hiding it. Continue with the PostHog events not showing checklist if it still does not appear.

Choose the right guide

Use the panel reference to learn each DevTools surface, or review detection limits before drawing conclusions from missing SDK state or requests. The PostHog debugging tools comparison explains when browser Network tools or the official PostHog Toolbar are the better next view.

Before exporting or sharing inspected data, read the PostHog Debugger privacy policy. Return to the product overview for feature details, source, releases, and installation links.