randomAlphaNumeric javascript Code Snippet in 2025

Generates a random string with the specified length.

• Use Array.from() to create a new array with the specified length.
• Use Math.random() generate a random floating-point number, Number.prototype.toString(36) to convert it to an alphanumeric string.
• Use String.prototype.slice(2) to remove the integral part and decimal point from each generated number.
• Use Array.prototype.some() to repeat this process as many times as required, up to length, as it produces a variable-length string each time.
• Finally, use String.prototype.slice() to trim down the generated string if it's longer than the given length.

const randomAlphaNumeric = length => {
  let s = '';
  Array.from({ length }).some(() => {
    s += Math.random().toString(36).slice(2);
    return s.length >= length;
  });
  return s.slice(0, length);
};

randomAlphaNumeric(5); // '0afad'