passport.authenticate() followed by(req, res, next)

[jeremyshen1987]

Hey there,

I'm wondering what is the purpose of (req, res, next) at the end of passport.authenticate() ? If I remove those arguments, postman will froze and never get a response back.

app.post("/login", (req, res, next) => {
passport.authenticate("local", (err, user, info) => {
if (err) throw err;
if (info) res.json({errorMsg: info.message});
else {
res.json({userObj: user})
}
})(req, res, next); <== ====THIS LINE
});

Thanks,
Jeremy