app.get('/login', function (req, res, err) {
    var whereUser = {
        login: req.query.login,
        password: req.query.password
    }

    if (!req.query.login || !req.query.password) {
        res.send('login failed');
//Here my code is wrong !
I try to compare login and password values with database login and passwword values
            } else if (req.query.login && req.query.password == UsrPerson.findOne({ where: whereUser })) {
                console.log("auth ok")
                req.session.user = "amy";
                req.session.admin = true;
                res.send("login success!");
            } else {
                console.log("ERROR")
                res.send(err)
            }
        });