if the email is not registered in the database, then data cannot be transferred to the email, I use NodeJs, NodeMailer and MYSQL for the database - mysql

Question

permission to ask the temperature, so I use NodeMailer to send data email, the problem is that emails that are not registered in the database can still send the data. registered"
const sendMail = async (req, res) => {
const querySearch = 'SELECT * FROM user WHERE email="' + req.body.email + '"';
const email = req.body.email;
koneksi.query(querySearch, async (err, rows, field) => {
const random = require("simple-random-number-generator");
let params = {
min: 0000,
max: 9999,
integer: true
};
const CodeRandom = random(params);
const querySql = 'UPDATE user SET ? WHERE email = ?';
koneksi.query(querySql, [{ code_verification: CodeRandom, }, req.body.email], (err, rows, field) => {
// error handling
if (err) {
return res.status(500).json({ message: 'Gagal update code!', data: { code_verification: "" } });
}
const transporter = nodemailer.createTransport({
service: 'gmail',
auth: {
user: '***********#gmail.com',
pass: '*********'
}
});
const mailOptions = {
from: 'muthiazraihan27#gmail.com',
to: req.body.email,
subject: 'Kode Verifikasi Lupa Password',
html: '<h2>Berikut kode reset password anda:</h2><h1> ' + CodeRandom + '</h1> '
};
transporter.sendMail(mailOptions, (err, info) => {
if (err) {
console.log(err)
res.status(500).json({ message: 'Ada kesalahan', error: err })
} else {
res.status(200).json({
success: true, data: rows[0]
})
}
})
})
})
};
in order to answer my question