node.js - Passport authenticate is always executing failureRedirect -

i using passport.js authenticate users node.js backend app. following code performing failureredirect , not able find reason it. there no error message.

router.post('/login', passport.authenticate('local', {                                                     failureredirect: '/users/login',                                                     failureflash: 'invalid email or password'                                                 }), function(req, res) { console.log('authentication successful'); req.flash('success', 'you logged in '); res.redirect('/'); }); 

i copied code passport website , not working:

router.post('/login', passport.authenticate('local', { successredirect: '/',                                                 failureredirect: '/users/login' })); 

the following code not starting:

passport.use(new localstrategy({                             email: 'email',                             password: 'password'                             }, function(email, password, done) { user.getuserbyemail(email, function(err, user) {     if (err) throw err;     if (!user) {         console.log('unknown user');         return done(null, false, {             message: 'unknown user'         });     }      user.comparepassword(password, user.password, function(err, ismatch) {         if (err) throw err;         if (ismatch) {             return done(null, user);         } else {             console.log('invalid password');             return done(null, false, {                 message: 'invalid password'             });         }     }); }); })); 

rest of relevant code:

passport.serializeuser(function(user, done) {   done(null, user.id); });  passport.deserializeuser(function(id, done) { user.getuserbyid(id, function(err, user) {     done(err, user); }); });   module.exports.getuserbyemail = function(email, callback){ var query = {email: email};    user.findone(query, function(err, user) {     callback(err, user);   });  }  module.exports.getuserbyid = function(id, callback){   user.findbyid(id, function(err, user) {     callback(err, user);   });  }  module.exports.comparepassword = function(userpassword, hash, callback){   console.log("pwd: " + userpassword + " hash: " + hash);   bcrypt.compare(userpassword, hash, function(err, ismatch) {     if(err) return callback(err);     callback(null, ismatch);   }); } 

try changing localstrategy configuration this one

the default login variable name express uses 'username' , 'password'. in case have changed, 'email' in above case code should modified in following way:

passport.use(new localstrategy({usernamefield: 'email'}, function(username, password, done){   user.getuserbyemail(username, function(err, user){   //rest of code 

without change in usernamefield, localstrategy searches 'username' not find hence, redirects. when usernamefield changed, finds 'email' , uses in place of username authentication.