Passport.js更改默认错误消息

Question

I'm using Passport.js for authentication in my node/express app, when input fields are empty passport displays default message "Missing credentials", how can i change that? to say something like please fill the form or something

here my local strategy for login:

  passport.use('login', new LocalStrategy({
      usernameField: 'email',
      passwordField: 'password'
    },
    function(email, password, done) {
      models.User.findOne({where: {email}}).then(user => {
        if (!user)
          return done(null, false, {message: 'Email not registered'});
        user.checkPassword(password).then(res => {
          if (!res)
            return done(null, false, {message: 'Incorrect username or password'});
          return done(null, user);
        });
      });
    }));

login route:

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

Answer 1

I got it, looks like i can pass optional callback to authenticate function to override default functionality, thanks oneturkmen for reference.

here's modified route:

router.post('/signup', (req, res) => {
  passport.authenticate('signup', (err, user, info) => {
    const body = req.body;
    if (req.body.username === '' || req.body.email === '' || req.body.password === '')
      info.message = 'Please fill the form';
    req.logIn(user, err => {
      if (err) res.render('users/signup', info);
      else res.redirect('/');
    });
  })(req, res);
});

Answer 2

An alternative is to add " badRequestMessage " to your code

Your code will look like this

router.post('/login', passport.authenticate('login', {
  successRedirect: '/',
  failureRedirect: '/login',
  badRequestMessage : 'Please fill the form',
  failureFlash: true
}));