Web Reference: Sep 30, 2016 · I tried to follow the expressjs/session tutorial on GitHub, however I am getting req.session as undefined, so I am unable to set or get any values. My goal is to save the first and last name of a user to a cookie so that an input field will auto populate. 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. To store or access session data, simply use the request property req.session, which is (generally) serialized as JSON by the store, so nested objects are typically fine.
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