Adding a function to imports routes in app.use()

Question

Hi everyone I have an API and I have made a function to check if a user is authenticated, if he is then the API redirects him to the home page else to the /login page ,

1. Authenticate function:

   function checkAuthenticated(req, res, next) {
      if (req.isAuthenticated()) {
           return next()
     }
     res.redirect('/login')
   }
   

2. Homepage route :

    app.get('/', checkAuthenticated, (req, res) => {
      res.render('index.ejs', { name: req.user.name })
    })
   

But now I want to add this functionality to other routes like the import routes I have made, For that i copied the function in the route endpoint like this:

router.get('/',function (req, res) {
  if (req.isAuthenticated()) {
   //Display the articles
    console.log('request: GET /newspapers')             
    res.status(200).json(jornales)
    console.log('auth')
  }
 res.redirect('/login')
}

Problem: Now the function redirects the user to /login if he's logged in,BUT it doesn't show the JSON result if he is logged in instead it redirects him to the homepage.

Server.js

   
app.use('/api/v3/newspapers', v3newspapersRoute);//v3newspapersRoute

// calling the validation function that takes user.email & user.id
const initializePassport = require('./passport-config')
initializePassport(
  passport,
  email => users.find(user => user.email === email),
  id => users.find(user => user.id === id)
)
// adding ejs so the system can acces the data enterd in the ejs forms to red
app.set('view-engine', 'ejs')
app.use(express.urlencoded({ extended: false }))
app.use(flash())
app.use(session({// PROBLEM
  secret: process.env.SESSION_SECRET,
  resave: false,
  saveUninitialized: false
}))
app.use(passport.initialize())
app.use(passport.session())
app.use(methodOverride('_method'))

//--- ROUTES 
// HOME , first check if he's authenticated, if yes redricet to index.ejs else go to login
app.get('/', checkAuthenticated, (req, res) => {
  res.render('index.ejs', { name: req.user.name })
})

function checkAuthenticated(req, res, next) {
  if (req.isAuthenticated()) {
    return next()
  }
  res.redirect('/login')
}

function checkNotAuthenticated(req, res, next) {
  if (req.isAuthenticated()) {
    return res.redirect('/')
  }
  next()
}

app.listen(3000)

Newspapers.js

const passport = require('passport')
const flash = require('express-flash')
const session = require('express-session')
const methodOverride = require('method-override')
const express = require('express')
const initializePassport = require('../../../passport-config')
initializePassport(
  passport,
  email => users.find(user => user.email === email),
  id => users.find(user => user.id === id)
)
//router.set('view-engine', 'ejs')
router.use(express.urlencoded({ extended: false }))
router.use(flash())
router.use(session({// PROBLEM
  secret: process.env.SESSION_SECRET,
  resave: false,
  saveUninitialized: false
}))
router.use(passport.initialize())
router.use(passport.session())
router.use(methodOverride('_method'))

//Get all newspapers (id,website,source) ---- DONE
router.get('/',function (req, res) {
  if (req.isAuthenticated()) {
    //Display the articles
      console.log('request: GET /newspapers')             
      res.status(200).json(jornales)
      console.log('auth')
  }
  res.redirect('/login')
});

function checkAuthenticated(req, res, next) {
  if (req.isAuthenticated()) {
    return next()
  }
  res.redirect('/login')
}

function checkNotAuthenticated(req, res, next) {
  if (req.isAuthenticated()) {
    return res.redirect('/')
  }
  next()
}
///

module.exports = router;

passport-config

const LocalStrategy = require('passport-local').Strategy
const bcrypt = require('bcrypt')

function initialize(passport, getUserByEmail, getUserById) {
  const authenticateUser = async (email, password, done) => {
    const user = getUserByEmail(email)
    if (user == null) {
      return done(null, false, { message: 'No user with that email' })
    }

    try {
      if (await bcrypt.compare(password, user.password)) {
        return done(null, user)
      } else {
        return done(null, false, { message: 'Password incorrect' })
      }
    } catch (e) {
      return done(e)
    }
  }

  passport.use(new LocalStrategy({ usernameField: 'email' }, authenticateUser))
  passport.serializeUser((user, done) => done(null, user.id))
  passport.deserializeUser((id, done) => {
    return done(null, getUserById(id))
  })
}

module.exports = initialize

PS: I'm noob & I'm using ejs for the home/login/register pages and not for the other routes

Youtube video i followed: https://www.youtube.com/watch?v=-RCnNyD0L-s&t=135s