Set cookie for domain instead of subDomain using NodeJS and ExpressJS
configure it like this:
app.use(express.session({ secret: conf.secret, cookie: { domain:'.yourdomain.com'}, store: new MongoStore(conf.sessiondb)}));
Try to use the following link to configure.
res.cookie('name', 'tobi', { domain: '.example.com', path: '/admin', secure: true });