Convert Base64 encoded 16 byte binary UUID to Hex and hyphenate

Base64BinaryUuidDecode.js

function UuidFromBinary(binary) {
  const bytes = new Uint8Array(binary.length);
  for (let i = 0; i < bytes.length; i++) {
    bytes[i] = binary.charCodeAt(i);
  }
  
  let result = '';
  for (let i = 0; i < bytes.length; i++) {
    result += (bytes[i] & 0xFF).toString(16).padStart(2, '0');
  }

  return result.slice(0, 8) + '-' + result.slice(8, 12) + '-' + result.slice(12, 16) + '-' + result.slice(16, 20) + '-' + result.slice(20,32);
}


binaryUUID = "\xDE\xAD\xBE\xEF\xCA\xFE\xF0\x0D\xBA\xBE\xC0\x01\xE5\x7B\x00\xB5"; // 0xDEADBEEFCAFEF00DBABEC001E57B00B5

b64 = btoa(binaryUUID); // "3q2+78r+8A26vsAB5XsAtQ=="
console.log(b64);

binary = atob(b64);
uuid = UuidFromBinary(binary);
console.log(uuid);
// Should return "deadbeef-cafe-f00d-babe-c001e57b00b5"

// Check on https://jsfiddle.net/5roncLks/3/