Generate Random String

generateRandomString.js

function generateRandomString(length) {
  var id = "";
  for (let i = 0; i < length; i++) {
    const r = getRandomNumber();
    if (r < 0.5) {
      id += getNumberWithinRange(r, 0, 9);
    } else {
      id += String.fromCharCode(getNumberWithinRange(r, 97, 122));
    }
  }
  return id;
}

function getRandomNumber() {
  if (window.crypto && window.crypto.getRandomValues) {
    // Divide a random UInt32 by the maximum value (2^32 -1) to get a result between 0 and 1
    return window.crypto.getRandomValues(new Uint32Array(1))[0] / 4294967295;
  }
  return Math.random();
}

function getNumberWithinRange(r, min, max) {
  return Math.floor(r * (max - min + 1)) + min;
}