Detecting admin context in hooks

[anatolykopyl]

I'd like to be able to tell if a request is being made from the admin panel or from elsewhere.

My use case is that I have to replace certain placeholders across all documents, for example every occurrence of %employee-count% should be replaced with a value from a specific collection. The problem is that once a field with this placeholder is created, the placeholder will never be visible in the admin panel, since if an afterRead hook replaces it with a number, it does so both on the website and in the admin panel.

The workaround I currently have is that I check for the req.payloadAPI inside of the hook to not be local. But this only works because I don't use the local API in my actual website.