Web Reference: Jan 16, 2026 · This problem can grind development to a halt, as `req.user` is critical for accessing authenticated user data in protected routes. In this guide, we’ll demystify why `req.user` might vanish after a redirect and walk through actionable troubleshooting steps to fix it. Dec 28, 2023 · The req.user undefined error typically happens in Express applications using Passport for authentication when Passport is not correctly configured or integrated within the application flow. This property is supposed to hold the current... May 8, 2013 · Once you have your express session setup make sure you have passport serialize & deserialize, in the deserialize function that's when req.user gets generated. See explanation here from another stackoverflow question.
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