How to hook into express session creation event

Question

How can I tell when express creates a new session? I'm using a mongodb session store.

I'm having an issue with extra sessions being created, and want to narrow down on the problem by tracking which urls requests are triggering new sessions to be created.

Answer 1

This is what I ended up doing.

app.use(function(req, res, next) {
    if (!req.session.returning) {
        // session was just created
        req.session.returning = true
    } else {
        // old session
    }
    next()
})