Personal TOTP URL Generator

totp.js

function generateTOTPURL(secret, label,issuer) {
  return `otpauth://totp/${label}?secret=${secret}&issuer=${issuer}`;
}

// Function to encode a string to Base32
function base32Encode(str) {
  const base32Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
  let binString = '';
  for (let i = 0; i < str.length; i++) {
    const charCode = str.charCodeAt(i);
    const binChar = charCode.toString(2).padStart(8, '0');
    binString += binChar;
  }

  let encodedStr = '';
  for (let i = 0; i < binString.length; i += 5) {
    const chunk = binString.slice(i, i + 5);
    const index = parseInt(chunk, 2);
    encodedStr += base32Chars[index];
  }

  return encodedStr;
}

const secret = 'PUT A GOOD SECRET HERE';
const label = 'SOME LABEL';
const issuer = 'SOME OTHER LABEL';

const encodedSecret = base32Encode(secret);
const totpURL = generateTOTPURL(encodedSecret, label, issuer);
//USE ANY QR CODE GENERATOR TO GENERATE THE QR CODE FROM THE totpURL
console.log(totpURL);