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404 tracking

Find broken links and dead pages by flagging your not-found template with a single attribute.

Kobbe can record every time a visitor lands on a missing page, so you can find broken internal links, outdated backlinks, and mistyped URLs. It works with both the lightweight tracker and the full tracker, and it is off until you flag your 404 template.

Setup

Add the data-kobbe-not-found attribute to any element that only renders on your 404 page, the <html> tag, the <body> tag, or the page wrapper all work:

<div data-kobbe-not-found>
  <h1>Page not found</h1>
</div>

That’s the whole setup. When the tracker loads on a flagged page, it sends a 404 event with:

  • The missing path the visitor requested.
  • The page that linked to it — an internal path for same-site navigation, or the full external URL for off-site links.

No extra payload, cookies, or identifiers are collected; the event uses the same privacy-friendly shape as a pageview.

Where the data shows up

Open your dashboard and switch the Pages card to the 404s tab. Each row shows the dead path, how many times it was hit in the selected range, and the page that most often linked to it, so you know exactly which link to fix.

404 events are kept separate from your custom events, conversions, and funnels, so they never pollute your regular event data.

Framework notes

  • Static sites and SPAs: make sure your not-found route actually renders the flagged template. If your host serves a soft 404 (a 200 page), Kobbe still records it as long as the attribute is present.
  • Server-rendered apps: add the attribute in the 404 template only, not in shared layouts.
  • The event name 404 is reserved, the tracker and API treat it as broken-page telemetry, not a custom event.