Hello, I have few questions regarding express-session middleware. Here is my code:

    secret: 'keyboard cat',
    saveUninitialized: false,
    resave: false,

app.get('/', (req, res) => {

I noticed that everytime I’m hitting the '/' route the server is console.logging another session ID each time. However when I’m attaching something to req.session like this:

  req.session.dbId =;

Server is console.logging the same session ID after each request. Also after checking Appliaction info in Chrome Dev Tools I noticed that cookie is created (after attaching this dbId to req.session). So here are my questions:

  1. Why cookie was not set at the beggining when I didn’t attach anything to req.session?
  2. Why attaching something to req.session cause express-session to create cookie?

try to use saveUninitialized: true

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