node js and passport validation miss passport session - mongodb

Question

I have app.js as below
var express = require('express'),
path = require('path'),
favicon = require('serve-favicon'),
logger = require('morgan'),
cookieParser = require('cookie-parser'),
bodyparser = require('body-parser'),
db = require('./model/db');
var app=express();
var dbConfig = require('./db.js');
var mongoose = require('mongoose');
mongoose.Promise = global.Promise;
mongoose.createConnection(dbConfig.url);
var passport = require('passport');
app.use(bodyparser.urlencoded({
extended:true
}));
var expressSession = require('express-session');
var flash = require('connect-flash');
app.use(expressSession({
secret: 'crackalackin',
resave: true,
saveUninitialized: true,
cookie : { secure : false, maxAge : (4 * 60 * 60 * 1000) }, // 4 hours
}));
app.use(passport.initialize());
app.use(passport.session());
// Using the flash middleware provided by connect-flash to store messages in session
// and displaying in templates
var flash = require('connect-flash');
app.use(flash());
// Initialize Passport
var initPassport = require('./passport/init');
initPassport(passport);
var routes = require('./routes/index')(passport);
app.use('/', routes);
/// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
app.listen(6061,function(){
console.log("started on port 6061");
});
/passport/init.js
var login = require('./login');
var signup = require('./signup');
var User = require('../models/user');
module.exports = function (passport) {
// Passport needs to be able to serialize and deserialize users to support persistent login sessions
passport.serializeUser(function (user, done) {
done(null, user._id);
});
passport.deserializeUser(function (id, done) {
try {
User.getById(id, function (err, user) {
done(err, user);
});
} catch (ex) {
}
});
// Setting up Passport Strategies for Login and SignUp/Registration
login(passport);
signup(passport);
}
when I write console.log(req.session) in /passport/login.js at validation function.
I get output like
Session {
cookie:
{ path: '/',
_expires: 2017-02-01T14:10:38.523Z,
originalMaxAge: 14400000,
httpOnly: true,
secure: false } }
I miss the
passport: {}
so I can login but can not generate passport session.
So isAuthenticated function say "login plase".
how can I manage session here.