base64 strings join concat nodejs

joinBase64Strings.js

function joinBase64Strings(base64Str1, base64Str2) {
  const bothData = Buffer.from(base64Str1, 'base64').toString('binary') + Buffer.from(base64Str2, 'base64').toString('binary');
  const joinedBase64Result = Buffer.from(bothData.toString(), 'binary').toString('base64');
  console.log('joinedBase64Result', joinedBase64Result);
  return joinedBase64Result;
}