CSRF token expired when page is left open

What I was trying to achieve is to instead of throwing an error (exception) I would handle the error by returning a 403 failed response and that would solve the issue of expired tokens bloatin my error monitor.

It would be nice to have an entry point to handle errors caught on filters, but I do not have knowledge if that feature exists.

You can create your own CSRF filter based on the framework CSRF filter:
https://github.com/codeigniter4/CodeIgni...hp#L55-L63
and see https://www.codeigniter.com/user_guide/i...g-a-filter

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