NodeJS encoding of NodeMailer username

I am using the node mail program to send multiple emails using a custom smtp transporter and I would like to encode the username and password for my mail server. Is there a way to do this?

var transport = nodemailer.createTransport(smtpTransport({
            host: 'smtp.example.com',
            port: 25,
            tls: {
                rejectUnauthorized: false
            },
            auth: {
                user: 'no-reply@example.com',
                pass: 'example'
            }
        }))

      

        
        
        
      

    

I would like to have something like this:

  auth: {
                user: 'bm9tcmVwbHk=',
                pass: 'QVRGGGF0QTE='
            }

      

        
        
        
      

    

Thank!