use sendgrid to send email with nodeJS

email.js

const nodemailer = require('nodemailer');
const sendgridTransport = require('nodemailer-sendgrid-transport');

const transporter = nodemailer.createTransport(
    sendgridTransport({
        auth: {
            api_key:
            process.env.SENDGRID_API_KEY
        }
    })
);

exports.sendEmail(mailOptions) {
    transporter.sendMail({
        to: mailOptions.to,
        from: mailOptions.from,
        subject: mailOptions.subject,
        html: mailOptions.html
    })}