Create a random token in Javascript based on user details

Question

I want to create a random string (token) which can be used to identify a user whilst avoiding any potential conflicts with any other users\' tokens.

What I was thinking

Answer 1

It is very unlikely, but Math.random() could return 0.0. In that case, the solution of pimvdb would return "" (empty string). So, here is another solution, which returns in every case a random base36 with 10 chars length:

function generateToken() {
    Math.floor(1000000000000000 + Math.random() * 9000000000000000)
          .toString(36).substr(0, 10)
}