After running the axios post method, it gives an error no matter how I go to the '/api/user' path, if I try to run the getUser function after running the onSubmitLogin function, it still gives an error.

I am attaching all relevant codes

User login post method axios

 function onSubmitLogin(data) {
    var url = "http://localhost:3001/api/user/login";
    axios({
      method: "POST",
      data: {
        username:data.username,
        password:data.password
      },
      withCredentials: true,
      url: url
    }).then(response => console.log(response))

  }

User login post method nodejs

exports.userLogin = (req, res, next) => {
    passport.authenticate('local',  (err, user, info) => {
        if (err) throw err;
        if (!user) {
            res.status(404).send('user not found')
        }
        else {
             req.login(user,  err => {
                if (err) throw err;
                res.status(200).send(req.user)
            })
        }
    })(req,res,next)
} 

getUser function axios

  function getUser() {
    var getUrl = "http://localhost:3001/api/user"
    axios({
      method:"GET",
      withCredentials:true,
      url:getUrl,
    }).then(response => console.log(response.data))
  }

user get method nodejs

exports.getUser = (req,res) => {
    res.send(req.user)
}

and passport-config.js

const LocalStrategy = require('passport-local').Strategy
const bcrypt = require('bcrypt');
const User = require('./models/userModel.js');


function initialize(passport) {
    passport.use(
        new LocalStrategy((username, password, done) => {
            User.findOne({ username: username })
                .then((user, err) => {
                    if (err) throw err;
                    if (!user) return done(null, false);
                    bcrypt.compare(password, user.password, (err, result) => {
                        if (err) throw err;
                        if (result) {
                            return done(null, user)
                        } else {
                            return done(null, false)
                        }
                    })

                })

        })
    );

    passport.serializeUser((user, cb) => {
        cb(null, user.id)
    });
    passport.deserializeUser((id, cb) => {
        User.findOne({ _id: id })
        .then((err, user) => {
            cb(err, user)
        })
    })


}

module.exports = initialize;

Edit

I don't get this error when I set the withCredentials value to false, but at that time the authentication system does not work properly.