CODE EXAMPLE FOR JAVASCRIPT

passport-local strategy

passport.use(new LocalStrategy(
  // function of username, password, done(callback)
  function(username, password, done) {
    // look for the user data
    User.findOne({ username: username }, function (err, user) {
      // if there is an error
      if (err) { return done(err); }
      // if user doesn't exist
      if (!user) { return done(null, false, { message: 'User not found.' }); }
      // if the password isn't correct
      if (!user.verifyPassword(password)) { return done(null, false, {   
      message: 'Invalid password.' }); }
      // if the user is properly authenticated
      return done(null, user);
    });
  }
));