Web Reference: Dec 3, 2021 · Express-session will access the session object on a future request if the incoming request contains the same session cookie. Not sure what else you're asking? Jan 16, 2026 · Cause: Session timeout, misconfigured session state (e.g., InProc mode in ASP.NET with app pool recycling), or missing express-session middleware in Node.js. Fix: Use a persistent session store (e.g., Redis for Node.js, SQL Server for ASP.NET) and ensure session cookies are enabled. Nov 26, 2025 · This error occurs when you try to access `req.session.user` but `req.session` itself is `undefined`, leaving `user` unreadable. In this blog, we’ll demystify this error, walk through setting up sessions correctly, and teach you how to check for sessions safely to avoid this issue.
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