const nodemailer    = require('nodemailer');

const transporter = nodemailer.createTransport({
    service: 'gmail',
    auth: {
        user: 'example@gmail.com',
        pass: 'olo-lo'
    }
});

app.post('/form-data', (req, res) => {
     var mailOptions = {
                    from: 'example@gmail.com',
                    to: 'example@gmail.com',
                    subject: 'OLOLO',
                    html: ``
                };
});

transporter.sendMail(mailOptions, function(error, info){
                    if (error) {
                        console.log(error);
                    } else {
                        console.log('Email sent: ' + info.response);
                    }
                });