What does "req.user Undefined" mean in the context of using Node, Express, and Passport together?

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"req.user Undefined" means that the user object is not present on the request object. This often happens when there is no user session available or when the user has not been authenticated by Passport. It can also occur if there are issues with the middleware order or configuration. It is important to ensure that the Passport middleware is properly configured and is being used before any routes that require authentication.