Zoho mail says 535 Authentication Failed in Node Js - node.js

Question

I am creating an Application using Node Express and MongoDB. After user creation a successful mail want to send to the user. I am using zohomail and can able to use those username and password to login zohomail online. But when I try to send mail I got an error as
code: 'EAUTH',
response: '535 Authentication Failed',
responseCode: 535,
command: 'AUTH PLAIN'
This is my code
helped snippet from
if (user) {
var transporter = nodemailer.createTransport({
host: 'smtp.zoho.com',
port: 465,
secure: true, // use SSL
auth: {
user: 'sample#sample.com', //zoho username
pass: 'password' //zoho password## Heading ##
}
});
var mailOptions = {
from: 'sample#sample.com',
to: req.body.email,
subject: 'Created Successfully',
html: '<h1>Hi ' + req.body.fname + ',</h1><p>You have successfully created.</p>'
};
transporter.sendMail(mailOptions, function(error, info) {
if (error) {
console.log(error);
} else {
res.status(200).send(setting.status("User created Successfully, Please Check your Mail"))
}
});
}

Answer 1

Thank you Nguyen Manh Tung
As said in comment.
I had enabled 2 Factor Authentication (2FA) in Zoho mail.
So, I login my account here and go to the Two Factor Authentication and get Application specific password.
After that I used the application specific password instead of zoho mail password in Node Js.
if (user) {
var transporter = nodemailer.createTransport({
host: 'smtp.zoho.com',
port: 465,
secure: true, // use SSL
auth: {
user: 'sample#sample.com', //zoho username
pass: 'application specific password' //Not zoho mail password because of 2FA enabled
}
});
var mailOptions = {
from: 'sample#sample.com',
to: req.body.email,
subject: 'Created Successfully',
html: '<h1>Hi ' + req.body.fname + ',</h1><p>You have successfully created.</p>'
};
transporter.sendMail(mailOptions, function(error, info) {
if (error) {
console.log(error);
} else {
res.status(200).send(setting.status("User created Successfully, Please Check your Mail"))
}
});
}

Answer 2

1/ Check your password.
2/ Check 2 factor authentication
Did you enable 2 factor authentication with Zoho?
If you enabled it, you need to create application specific password.

Answer 3

If you are from India, replace smtp.zoho.com with smtp.zoho.in keeping other things same. Sample is given below:
const transporter = nodemailer.createTransport({
host: "smtp.zoho.in",
port: 465,
secure: true,
auth: {
user: process.env.ZOHO_EMAIL,
pass: process.env.ZOHO_PASSWORD,
},
});

Answer 4

For anyone still facing authentication errors after adding 2 Factor authentication and generating an App password. If you created your Zoho Mail account from the EU please change your host to the following:
host: "smtp.zoho.eu"