Express-session does not create any session - mongodb

Question

Im trying to implement some basic sessions functionality in my toy project with express-session and connect-mongo for session storage.
What i expect:
Browser gets cookie after recieving response from server
Session data is written to collection "sessions"
I get debug messages from express-session in console, because i start the app with DEBUG=express-session:* nodemon ./bin/www
What i get instead:
Browser never gets cookie
No documents are being created in the collection (the collection itself is being created every time i launch the app though)
There are no debug messages from express-session in the console
Everything related to DB and session setups in the app.js file:
// DB setup
var mongoDB = require('./k'); // K is a file containing connection string
mongoose.connect(mongoDB, {
useNewUrlParser: true,
useUnifiedTopology: true
})
var db = mongoose.connection
db.on('error', console.error.bind(console, 'MongoDB connection Error: '))
// Session setup
const connection = mongoose.createConnection(mongoDB, {
useNewUrlParser: true,
useUnifiedTopology: true
})
const sessionStore = new MongoStore({
mongooseConnection: connection,
collection: 'sessions'
})
app.use(session({
secret: 'some secret',
resave: false,
saveUninitialized: true,
store: sessionStore,
cookie: {
maxAge: 1000 * 60 * 60 * 24
}
}));
Is there anything i clould be missing? What could be causing this issue for me?

Answer 1

Try:
var MongoStore = require('connect-mongostore')(session);
app.use(session({
secret: 'my secret',
store: new MongoStore({'db': 'sessions'})
}));

Answer 2

Looks like the problem was being caused by the order of middleware in my app.js file. I moved the code with DB setup and session setup right above routers and it worked. app.js before:
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var logger = require('morgan');
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var entriesRouter = require('./routes/entries')
const categoriesRouter = require('./routes/categories')
const session = require('express-session');
const MongoStore = require('connect-mongo')(session)
const mongoose = require('mongoose')
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({
extended: false
}));
// app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/entries', entriesRouter)
app.use('/categories', categoriesRouter)
// catch 404 and forward to error handler
app.use(function (req, res, next) {
next(createError(404));
});
// error handler
app.use(function (err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
// DB setup
var mongoDB = require('./k'); // K is a file containing connection string
mongoose.connect(mongoDB, {
useNewUrlParser: true,
useUnifiedTopology: true
})
var db = mongoose.connection
db.on('error', console.error.bind(console, 'MongoDB connection Error: '))
// Session setup
const connection = mongoose.createConnection(mongoDB, {
useNewUrlParser: true,
useUnifiedTopology: true
})
const sessionStore = new MongoStore({
mongooseConnection: connection,
collection: 'sessions'
})
app.use(session({
secret: 'some secret',
resave: false,
saveUninitialized: true,
store: sessionStore,
cookie: {
maxAge: 1000 * 60 * 60 * 24,
secure: false
}
}));
module.exports = app;
app.js after:
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var logger = require('morgan');
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var entriesRouter = require('./routes/entries')
const categoriesRouter = require('./routes/categories')
const session = require('express-session');
const MongoStore = require('connect-mongo')(session)
const mongoose = require('mongoose')
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({
extended: false
}));
// app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
// DB setup
var mongoDB = require('./k'); // K is a file containing connection string
mongoose.connect(mongoDB, {
useNewUrlParser: true,
useUnifiedTopology: true
})
var db = mongoose.connection
db.on('error', console.error.bind(console, 'MongoDB connection Error: '))
// Session setup
const connection = mongoose.createConnection(mongoDB, {
useNewUrlParser: true,
useUnifiedTopology: true
})
const sessionStore = new MongoStore({
mongooseConnection: connection,
collection: 'sessions'
})
app.use(session({
secret: 'some secret',
resave: false,
saveUninitialized: true,
store: sessionStore,
cookie: {
maxAge: 1000 * 60 * 60 * 24,
secure: false
}
}));
app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/entries', entriesRouter)
app.use('/categories', categoriesRouter)
// catch 404 and forward to error handler
app.use(function (req, res, next) {
next(createError(404));
});
// error handler
app.use(function (err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
module.exports = app;