Identify unique user?

What’s the best way to identify a device apart from the session, which then differs according to the pages opened?

Using the public IPAddress getting it using api.ipify.org ?

I forgot to specify that connections will only be made on my local Wifi network.
Can I get the MAC addresses of the users who will open my application’s web page?

Isn’t a cookie enough for what you need? Cookies are shared between all the other browser windows/tabs.

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Yes, I hadn’t thought of that! I’ll take a closer look, thanks to you…