Notional example of callback hell

hell.js

login.use(getLoginStrategies(function (db, session, done) {
    var retrievedUsername;
    var setUserName = function (a) {
        retrievedUsername = a
    }
    var retrievedProfile;
    var setProfile = function (a) {
        retrievedProfile = a
    }
    var user = db.getUser(
        session.getUsername(function (err, username) {
            if (err) return done(null);
            setUserName(username);
        }),
        function (err, user, done1) {
            if (err) return done(null);
            setTimeout(function () {
                if (user.username !== retrievedUsername) return done1(null);

                var profile = db.getProfile(
                    session.getCachedProfile(function (err, profile, verifyProfile) {
                        if (err) return done(null);
                        setTimeout(function () {
                            setProfile(profile);
                        },1)
                        setTimeout(function () {
                            if (profile === null) return done(null)
                            verifyProfile(function (err, result) {
                                if (err || result === false) return done(null)
                                setProfile(profile);
                            })
                        }, 200)
                    }),
                    function (err, user, done2) {
                        if (err) return done(null);
                        setTimeout(function () {
                            if (profile.updatedAgo > 3600) return done2(null);
                            if (retrievedProfile !== null) return done(retrievedProfile)
                            done2(retrievedProfile)
                        }, 1000)
                    });
                setTimeout(function () {
                    if (retrievedProfile !== null) {
                        profile.updatedAgo = 0;
                    }
                    done(profile)
                }, 5000);

            }, 1000)
        });
    setTimeout(function () {
        done(user)
    }, 6000);
}, function (err, profile, done) {
    if (profile) {
        return done(profile.getStrategy())
    }
    done(null);
}))