Issue: Unrecognized security method called "local" (Express & Passport)

Question

Issue: Unrecognized security method called "local" (Express & Passport)

I'm currently attempting to implement passport authentication within my express application.

router.get('/register', (req, res) => {
  res.render('register');
});

router.post('/register', function(req, res, next) {
  var username = req.body.username;
  var password = req.body.password;

  User.findOne({ username: username }, function(err, user) {

    if(err) { return next(err); }
    if(user) {
      req.flash('error', 'User already exists');
      return res.redirect('/register');
    }

    var newUser = new User({
      username: username,
      password: password
    });
    newUser.save(next);
  });
}, passport.authenticate('local', {
  successRedirect: '/',
  failureRedirect: '/register',
  failureFlash: true
}));

Although signing up a test user seems to work, I keep encountering the following error:

Error: Unknown authentication strategy "local"

Do you have any advice or suggestions on how to resolve this issue?

javascript mongodb express passport.js passport-local

Answer 1

Answer №1

If you haven't set up Passport to utilize the passport-local strategy yet, don't worry! You just need to follow a few steps - import it, instantiate it, and then tell Passport to put it into action. Check out this example below:

var LocalStrategy = require('passport-local').Strategy;

passport.use(new LocalStrategy(
  function(username, password, done) {
    User.findOne({ username: username }, function (err, user) {
      if (err) { return done(err); }
      if (!user) { return done(null, false); }
      if (!user.verifyPassword(password)) { return done(null, false); }
      return done(null, user);
    });
  }
));

router.post('/signup', function(req, res, next) {
  var username = req.body.username;
  var password = req.body.password;

  User.findOne({ username: username }, function(err, user) {

    if(err) { return next(err); }
    if(user) {
      req.flash('error', 'User already exists');
      return res.redirect('/signup');
    }

    var newUser = new User({
      username: username,
      password: password
    });
    newUser.save(next);

    passport.authenticate('local', { failureRedirect: '/signup' }),
     function(req, res) {
      res.redirect('/');
    });
  });
});

To learn more about the plugin, refer to the documentation here. Additionally, have a look at this sample app that demonstrates the authentication strategy here.

Answer 2

If you haven't set up Passport to utilize the passport-local strategy yet, don't worry! You just need to follow a few steps - import it, instantiate it, and then tell Passport to put it into action. Check out this example below:

var LocalStrategy = require('passport-local').Strategy;

passport.use(new LocalStrategy(
  function(username, password, done) {
    User.findOne({ username: username }, function (err, user) {
      if (err) { return done(err); }
      if (!user) { return done(null, false); }
      if (!user.verifyPassword(password)) { return done(null, false); }
      return done(null, user);
    });
  }
));

router.post('/signup', function(req, res, next) {
  var username = req.body.username;
  var password = req.body.password;

  User.findOne({ username: username }, function(err, user) {

    if(err) { return next(err); }
    if(user) {
      req.flash('error', 'User already exists');
      return res.redirect('/signup');
    }

    var newUser = new User({
      username: username,
      password: password
    });
    newUser.save(next);

    passport.authenticate('local', { failureRedirect: '/signup' }),
     function(req, res) {
      res.redirect('/');
    });
  });
});

To learn more about the plugin, refer to the documentation here. Additionally, have a look at this sample app that demonstrates the authentication strategy here.

Answer 3

Answer №2

Consider implementing a callback function following the use of local instead of transmitting an object. You can utilize the following approach:

    router.post("/register", function(req, res){
      var newUser = new User({username: req.body.username});
      User.register(newUser, req.body.password, function(err, user){
          if(err){
              req.flash("error", err.message); //for instance, if the username is already taken or no username provided
              res.redirect("/register");
          } else {
            passport.authenticate("local")(req, res, function(){
                res.redirect("/");
              });
            }
        });
    });

Answer 4

Consider implementing a callback function following the use of local instead of transmitting an object. You can utilize the following approach:

    router.post("/register", function(req, res){
      var newUser = new User({username: req.body.username});
      User.register(newUser, req.body.password, function(err, user){
          if(err){
              req.flash("error", err.message); //for instance, if the username is already taken or no username provided
              res.redirect("/register");
          } else {
            passport.authenticate("local")(req, res, function(){
                res.redirect("/");
              });
            }
        });
    });

Issue: Unrecognized security method called "local" (Express & Passport)

Answer №1

Answer №2

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