'How to identify a client with nodejs/express?

I am creating a web app that offers a membership access with a trial period. However, I need to be sure the users cannot create a new account with other credentials just to get another trial period and so on.

I was considering using req.connection.remoteAddress; to know if a client already claimed its trial but I am not sure this ip address will be unique to a specific machine.

Any idea ?

node.jsexpress


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