Track 404 Errors in GA4
Sends a page_not_found event to Google Analytics 4 with the broken URL and the page the visitor came from, so you can find and fix dead links.
Snippet Library
Analytics & Tracking snippets for WordPress
Snippets for analytics and tracking: add Google Analytics, Tag Manager or ad pixels, exclude logged-in users and track clicks or form sends. For marketers who want the tracking code in place without editing the theme.