How to authorize user in react app using cookie and wp rest api?

Question

WordPress

I made an application on react and placed it on the hosting in a subfolder next to the WordPress site. Now I want to make authorization in this application for WordPress users. It seems that the easiest or most convenient way is authorization using the REST API and authorization cookies.
Here is the official documentation, but I can't figure out where to put the php code. I couldn't find any examples on the internet.
https://developer.wordpress.org/rest-api/using-the...
Tell me where to write something.

Answer 1

This particular example with cookies does not suit you - you need to do a lot of improvements and you still have to deal with WP. But this does not mean that it will not work without pain.
The plugins for external authorization, described at the very bottom of this ill-fated manual, may be suitable for you. Choose the authorization to your taste and go ahead.