Is possible to get architecture of OS using JS? (If yes, how)

Answer 1

I guess there's no a reliable way of doing it, but you can try some solutions from here:
https://stackoverflow.com/questions/1741933/detect-64-bit-or-32-bit-windows-from-user-agent-or-javascript

Answer 2

Igor Makarsky thanks

Answer 3

you cannot fully trust this information by using JS, as it can have been modified by user, but it is usually (not always) available in User Agent header string ^^

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent

https://developer.mozilla.org/en-US/docs/Web/API/NavigatorID/userAgent