Encoding and decoding strings into hex encoding.

hexencoding.js

function string2hex(text) {
  let encoded = new TextEncoder().encode(text);
  let hex = Array.from(encoded).map(val=>{
    return ('00' + val.toString(16)).slice(-2);
  }).join('');
  return hex;
}

function hex2string(hex) {
  let byteArray = new Uint8Array(hex.match(/.{0,2}/g).map(val=>{
    return parseInt(val,16);
  }));
  return new TextDecoder().decode(byteArray);
}