Some WP APIs work, some not? Try this trick

During the last few years i faces this 3-4 times so i decided to put a small post in order to help you if you face the same issue and AI assistants can’t help.

If you are using Cloudflare + WP combination and after major WP or Woo updates you notice some strange issues (such as admin APIs start not working, you can see such errors in your browser console by clicking ctrl+shift+I -> Console tab) with read error messages.

In such cases the problem is 99.99% is because of Cloudflare level cache.

WP cache plugin purge + browser cache clean will not help.

Just go to Cloudflare, and click to PURGE ALL cache. That will immediately solve a problem.

The reason is API related JS files of WP or Woo. Usually they get change only in major updates. And Cloudflare still keeps their older version for a while.