Title changed by JavaScript

Warning severity, in the JavaScript tab

Why it matters

The title in the HTML response differs from the rendered one. Google usually indexes the rendered version, but rendering is deferred and other crawlers never see it.

How to fix it

Set the final title server-side so the response and the rendered DOM agree.

How Crawlune finds it

Crawlune flags Title changed by JavaScript automatically on every crawl and lists the affected URLs under the JavaScript tab, where you can filter, inspect each page and export the list to CSV. The free version crawls up to 550 URLs with every check enabled.