Session: Cannot read properties of undefined (reading 'session')

[Joshua Amaju]

The session module throws TypeError: Cannot read properties of undefined (reading 'session') at point of registering the middleware

app.use(
  session({
    // Session store
    store: new SimpleCookieStore(),
    // Default session data when a new session is created.
    // It can be a function.
    // It is shallow cloned, if you need a deep clone, use a function.
    defaultSessionData: {},
  })
);

Reproduction

[Fatih Aygün]

Thank you for reporting. Turns out it's not a bug but a serious documentation issue 😅

The session middleware requires the cookie middleware to be inserted before it or getSessionId option to be set for custom behavior. I updated the docs accordingly.

Btw I noticed that you're using Hattip as an Express middleware which is supported but it only makes sense if you have a hard requirement to use Express for some other reason. You can just use createServer instead of createMiddleware and get rid of Express entirely if you don't have such a requirement:

createServer(router.buildHandler()).listen(3000, "localhost", () => {
  console.log("Server listening on http://localhost:3000");
});

[Joshua Amaju]

That fixed it. Thanks