Node.js server gets stuck after a few API calls - node.js

Question

I have a node.js application where I'm using the sign in functionality.
I'm facing an issue; that is, when I try to sign in, sometimes the request gets stuck. It won't return anything until I refresh the node.js server. Can anybody take a look at the code and help me out what am I doing wrong here?
Here is my Controller function
export const authenticate = async (
req: Request,
res: Response
): Promise<void> => {
try {
console.log("Login")
const result: DataObject = await model.authenticate(
req.body.username,
req.body.password
)
const { status, data } = result
res.status(status)
if(status==200) {
console.log(status)
const u : User = data as User;
const token = jwt.sign({ id: u.id }, process.env.JWT_SECRET as string)
res.json({token: token})
}
else {
res.json(data)
}
} catch (error) {
res.status(NOT_FOUND)
res.json(error)
}
}
And my Model method.
async authenticate(username: string, password: string): Promise<DataObject> {
try {
const sql =
"SELECT * FROM users WHERE username=$1"
const conn: PoolClient = await Client.connect()
const result: QueryResult<User> = await conn.query(sql, [username])
const { rows } = result
if (rows.length > 0) {
const user: User = rows[0]
const pepper: string = process.env.PASSWORD_HASH as string
const pepperedPass = password + pepper;
const validPass : boolean = bcrypt.compareSync(pepperedPass, user.password_digest);
if (validPass) {
const result: DataObject = {
status: OK,
data: user,
}
return result
}
else {
const passErr: DataObject = {
status: NOT_FOUND,
data: "Incorrect Password",
}
return passErr
}
}
const userErr: DataObject = {
status: NOT_FOUND,
data: "No User found with this Username",
}
return userErr
} catch (error) {
const userErr: DataObject = {
status: NOT_FOUND,
data: "No User found with this Username",
}
return userErr
throw new Error(`Not found, ${error}`)
}
}
I have tried res._destroy, res.set("Connection", "close"); but the issue persists.
Any suggestion/solution is appreciated.
Thank you.