A converter for text to hexadecimel, and back to text (supports all unicode characters). Useful for places where base64 isn't usable, or doesn't support non-ascii characters.

hex-string.js

function strToHex(str) {
  return Array.from(str).map(char =>
    char.codePointAt(0).toString(16).padStart(4, '0')
  ).join('');
}

function hexToStr(hex) {
  let result = '';
  for (let i = 0; i < hex.length; i += 4) {
    result += String.fromCharCode(parseInt(hex.substring(i, i + 4), 16));
  }
  return result;
}

const hexed = strToHex("Łørem Ipsüм");
console.log(hexed);

const dehexed = hexToStr(hexed);
console.log(dehexed);