CODE EXAMPLE FOR JAVASCRIPT

Bare Minimum Passport Login Pages ExpressJS Only (Routes/Controller Page)

var express = require('express');
var router = express.Router(); 
const passport = require('passport');
const LocalStrategy = require('passport-local').Strategy;
const User = require('../models/user'); 
const bcrypt = require('bcrypt');
const saltRounds = 10;

passport.use('local',new LocalStrategy(
  function(username, password, done) {
    User.findOne({ username: username }, function (err, user) {
      if (err) { return done(err); }
      if (!user) { return done(null, false); }
      if (!bcrypt.compare(user.password, password)) { return done(null, false); }
      return done(null, user);
    });
  }
));
router.get("/", async  function(req, res, next) {
  res.render('index', {title: "Express"});
});
 
router.get("/main", async  function(req, res, next) {
	res.json({success: "success"});
});

router.get("/failure", async  function(req, res, next) {
	res.json({failure: "failure"});
});

router.post("/login", async function(req, res, next){
  passport.authenticate('local', {
    successRedirect: '/main',
    failureRedirect: '/failure',
    failureFlash: true
  })(req, res, next);
});
module.exports = router;