Send email verification mail and use custom domain to send emails using Node.js

I spent a lot of time figuring out the perfect way to send confirmation mail. Here is the method I used.

Libraries

Nodemailer- To send mails

JWT- To encode user data

 const jwt = require(‘jsonwebtoken’);
 const nodemailer = require(“nodemailer”);

Step 1
Encode the user id in a jwt token with an expiration date

var date = new Date();
 var mail = {
 “id”: user.id,
 “created”: date.toString()
 }
const token_mail_verification = jwt.sign(mail, config.jwt_secret_mail, { expiresIn: ‘1d’ });
 
 var url = config.baseUrl + “verify?id=” + token_mail_verification;

Step 2
Send the token to the user email address using nodemailer library

let transporter = nodemailer.createTransport({
 name: “www.domain.com",
 host: “smtp.domain.com”,
 port: 323,
 secure: false, // use SSL
 auth: {
 user: “user@domain.com”, // username for your mail server
 pass: “Password”, // password
 },
});
// send mail with defined transport object
 let info = await transporter.sendMail({
 from: ‘“NAME” <user@domain.com>’, // sender address
 to: user.email, // list of receivers seperated by comma
 subject: “Account Verification”, // Subject line
 html: "Hello,<br> Please Click on the link to verify your email.<br><a href="+url+">Click here to verify</a>"
 }, (error, info) => {
if (error) {
 console.log(error)
 return;
 }
 console.log(‘Message sent successfully!’);
 console.log(info);
 transporter.close();
 });

Step 3
Accept the verification link

app.get(‘/verify’, function(req, res) {
 token = req.query.id;
 if (token) {
 try {
 jwt.verify(token, config.jwt_secret_mail, (e, decoded) => {
 if (e) {
 console.log(e)
 return res.sendStatus(403)
 } else {
 id = decoded.id;
//Update your database here with whatever the verification flag you are using
}
});
 } catch (err) {
console.log(err)
 return res.sendStatus(403)
 }
 } else {
 return res.sendStatus(403)
}
})

Step 4
Have a coffee and thank mefor saving your time XD

PS: This nodemailer SMTP method will even work with your hosting. So no need to go for third party. You can also find ways to use gmail with nodemailer.