A non-crypto js function for creating random alphanum strings - no dependencies

makeNonCryptoRandomAlphaNumString.js

function makeNonCryptoRandomAlphaNumString(length) {
  function tf(n) {
    if (n < 26) return 65 + n
    else if (n < 52) return 97 + n - 26
    else return 48 + n - 52
  }
  var result = ''
  for (var i = 0; i < length; i++) {
    let idx = Math.floor(Math.random() * 62)
    result += String.fromCharCode(tf(idx))
  }
  return result
}