cryptoUUID.js

// Using the web crypto API is a quick way to get a pseudo-random number.
// It's is experimental in IE11 and namespaced behind a prefix.
var crypto = window.crypto || window.msCrypto;

// Generates a uuidv4-compliant string
// credit: https://gist.github.com/jed/982883
function uuidv4() {
  return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
    (
      c ^
      (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))
    ).toString(16)
  );
}