How to throw passport js connect flash errors?

Question

JavaScript

Greetings!
Help me understand how errors are caught and passed on using the passport library and flash connect

var express = require('express'),
    router = express.Router(),
    passport = require('../auth'),
    Render = require('../render'),
    render = Render.render;

var flash = require('connect-flash');

// middleware that is specific to this router

router
    .use(flash())
    .use(passport.initialize())
    .use(passport.session());

router.use(function(req, res, next) {
    res.locals.success_msg = req.flash('success_msg');
    res.locals.error_msg = req.flash('error_msg');
    res.locals.error = req.flash('error');
    next();
});

// Global routes

// Auth local
router.post('/admin/login/', passport.authenticate('local', 
    { failureRedirect: '/admin/login/', successRedirect: '/admin/', failureFlash: true }));

router.get('/admin/login/', function(req, res) {
    console.log(req);
    render(req, res, {
        view: 'admin-login',
        title: 'Панель управления - Вход',
        meta: {
            description: 'Page description',
            og: {
                url: 'https://site.com',
                siteName: 'Site name'
            }
        },
    })
})

here is the passport

// auth.js
var passport = require('passport');
var User = require('./model/user');
var LocalStrategy = require('passport-local').Strategy;
    
passport.serializeUser(function(user, done) {
    done(null, user);
});

passport.deserializeUser(function(user, done) {
    done(null, user);
});

passport.use(new LocalStrategy(function(username, password, done) {
  process.nextTick(function() {
    User.findOne({
      'username': username,
    }, function(err, user) {
      if (err) {
        return done(err, { message: 'Houston we have a some problem' });
      }

      if (!user) {
        return done(null, false, { message: 'Incorrect name.' });
      }

      if (user.password != password) {
        return done(null, false, { message: 'Incorrect password.' });
      }

      return done(null, user);
    });
  });
}));

module.exports = passport;

Answer 1

Everything here actually worked. only if you use middleware like use where I redefined the place where errors are stored, so to speak, then you had to look for them there)