Как отправить письмо на почту с помощью javascript?

 const express = require('express');  
const nodemailer = require('nodemailer'); 
 
const app = express(); 
 
app.post('/signup', function (req, res) {  
  // ... твой код регистрации
 
  const transporter = nodemailer.createTransport({  
  service: 'gmail',  
  auth: {  
    user: 'youremail@gmail.com',  
    pass: 'yourpassword'  
  }  
});  
  
const mailOptions = {  
  from: 'youremail@gmail.com',  
  to: 'myfriend@yahoo.com',  
  subject: 'Sending Email using Node.js',  
  text: 'That was easy!'  
};  
  
transporter.sendMail(mailOptions); 
  
});