Nodemailer error: verification email doesn't works - node.js

Question

I am writing this code to sign up the user.
I used Nodemailer to send a verification email to activate the account.
The post request works well but I did not receive a verification email and here is my code:
const transporter = nodemailer.createTransport({
service: "Gmail",
auth: {
user: process.env.EMAIL_USERNAME,
pass: process.env.EMAIL_PASSWORD,
},
});
exports.signup = async(req, res) => {
const { email } = req.body
if (!email) {
return res.status(422).send({ message: "Missing email." })
}
try {
const existingUser = await User.findOne({ email }).exec();
if (existingUser) {
return res.status(409).send({
message: "Email is already in use."
});
}
const user = await new User({
_id: new mongoose.Types.ObjectId,
email: email
}).save();
const verificationToken = user.generateVerificationToken();
const url = `http://localhost:5000/api/verify/${verificationToken}`
transporter.sendMail({
to: email,
subject: 'Verify Account',
html: `Click <a href = '${url}'>here</a> to confirm your email.`
})
return res.status(201).send({
message: `Sent a verification email to ${email}`
});
} catch (err) {
return res.status(500).send(err);
}
}
WHEN I SEND THE REQUEST, SHOWS ME LIKE THIS

Answer 1

Go to Google account, than Security and Less secure app access, and set to ON. Restart Your app and Now should up and running ;-)
Note That - In Your .env file, enter Your credentials without any quotes