How to get information about the client on the server?

Question

Node.js

How can I find out detailed information about the client that communicates with the server. For example phone.
Is it possible to find out its operating system, phone model, screen size, etc. ?
In node.js in particular and in general.

Answer 1

Look at ua-parser

Answer 2

No. You can't get it on your own.
The client must EXPLICITLY report this to the server CAM.