Locked Out, Sometimes

Auth / middleware bug · intermediate · MERN stack

Some logged-in users can open the dashboard, while others receive a 401 even though their token is valid.

The bug report

You get the whole project — a React front end, an Express API, and Mongoose models — opened in a browser editor. Reproduce the symptom by reading the code, change what’s wrong, and run the hidden tests to prove it.

What the fix must prove

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