Generate random string in JavaScript

generate_random_string.js

let defaultWhitelist = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

let generateRandomString = (len, whitelist = defaultWhitelist) => {
  if (len <= 0) throw new Error('Must use a positive length');
  let text = '';
  while ( len-- ) {
    text += whitelist.charAt(Math.floor(Math.random() * whitelist.length));
  }
  return text;
}

export default generateRandomString;