Tracking error messages and 404 pages
Error pages, broken links and script errors cost visits and rankings. We track them systematically and fix the causes in order of urgency.
Unnoticed errors
404 errors pile up after a redesign, when products are deleted or when campaigns carry wrong links. JavaScript errors can block forms or the checkout without anyone noticing. Linked pages that no longer exist also waste link equity and crawl budget.
Error sources
404 pages: requested URL and referring page, as a GA4 event
Search engines: pages not found or not indexed, from Google Search Console
Script errors: JavaScript errors in the browser, collected with services such as Sentry
Server errors: 5xx status codes from log files and monitoring
Analysis
We rank errors by frequency and impact. A broken campaign link is more urgent than an old URL typo, and a checkout error outranks a broken animation. The referring page shows where the error originates.
Fixing
We fix broken internal links at the source and set up 301 redirects for changed URLs. Removed pages redirect to the closest match or return a 410 status code. Google treats blanket redirects to the home page like error pages.
The 404 page itself offers search and routes to the main areas.
Ongoing monitoring
Alerts notify you as soon as error counts rise sharply, for example after a deployment. After a redesign we monitor 404 errors and redirects particularly closely.