How to make passportjs local username be case insensitive?

Question

Right now I'm using passportjs (local) for authentication on my site, but the username field is case sensitive, is there a way to change this? I thought about making the username all lowercase at the moment of registration, but that doesn't seem like a very efficient choice and still doesn't let me make log in case insensitive.

router.post("/login", middleware.isNotLoggedIn, passport.authenticate("local", {
successRedirect: "",
failureRedirect: "/login"
}), function(req, res){
    res.redirect("back");
});

Answer 1

I had the same problem myself. Seems like passport should have an official answer to this. Simplest way it to make a middleware. This middleware would need to be in TWO places. First in the register function so that the username is saved in lowercase. Then in the Login function as shown below for an example. Good luck!

  function usernameToLowerCase(req, res, next){
            req.body.username = req.body.username.toLowerCase();
            next();
        }
  router.post("/login", usernameToLowerCase, passport.authenticate("local", {
        successRedirect: "/",
        failureRedirect: "/login"
    }), function (req, res) {
    });