Strange nodejs behaviour when logging in a user - mysql

Question

The problem is that it shows that it is successfully logged in (201) without the redirect code, but with it, it shows a 302 error and the email_address is undefined.
What could be the problem here? I still can't come to a conclusion.
The problem may be in the order of the code I guess?
const login = async (req, res, next) => {
const { email_address, password, user_email, user_password}: { email_address: string, password: string, user_email: string, user_password: string } = req.body;
try {
const userWithDetails = 'SELECT * FROM users WHERE email_address = user_email AND password = user_password'; //w form info
if (userWithDetails) {
req.session.loggedin = true; //true
req.session.email_address = email_address; //undefined
console.log(req.session.email_address)
// return res.redirect('./index.html')
}
res.status(201).send('Succesfully signed in');
// res.status(403).send('Password is not correct');
} catch(error) {
res.status(404).send(`User with email ${email_address} not found!`);
}
await next;
};
NEW CODE ***
const login = async (req, res, next) => {
const { email_address, password}: { email_address: string, password: string} = req.body;
const userWithDetails = 'SELECT * FROM users WHERE email_address = ?';
return con.query(userWithDetails, email_address, (err, results) => {
if (err) {
console.error(err);
}
const user = results.find(emailObj => emailObj.email_address === email_address);
if (results && results.length && user.email_address) {
req.session.loggedin = true;
req.session.email_address = email_address;
const matchPassword: boolean = bcrypt.compareSync(password, user.password);
if (matchPassword) {
const token = jwt.sign({ user }, 'aaaa', { expiresIn: '1h'});
res.status(200).send({message: 'Logged in', token: token});
} else {
res.status(403).send('Password is not correct');
}
} else {
res.status(404).send(`User with email ${email_address} not found!`);
}
});
await next;
}

Answer 1

You don't execute your sql query at any point.
You just say :
query = 'select blabla'
if(query){...}
Of course this will always be true. You want to run the query on your database.
Also in your query you don't properly use the variables, see string formatting :
let my_var = `SELECT xxx from xxx where username = '${username}'`
Also please sanitize the parameters to prevent SQL Injection...