This is a passport LocaStrategy with custom error messages from my app.

nodejs passport configuration

  passport.use(new LocalStrategy(
    function(username, password, done) {
      if (username.indexOf('@') == -1) {
          username = username + '@example.com';
      }
      
      User.findOne({ 'email': username.toLowerCase()}, function(err, user) {
        if (err) { return done(err); }
        if (!user) {
          var error = new Error('User not found or wrong Credentials');
          return done(null, false, { message: error.message });
        }
        if (user.isValidPassword(password)) {
          return done(null, user);
        }
        var error = new Error('Invalid password');
        return done(null, false, { message: error.message });
      });
    }
  ));