Why My JWT Auth Failed in Express js Middleware Order Bug

Описание: I spent an hour debugging a JWT authentication issue in Express.js, only to realize the problem was middleware order.

I registered my routes before applying the express-jwt middleware, which meant protected routes were accessible without authentication. No error. No warning. Just broken security.

In this video, I show:

How Express middleware executes top to bottom

Why req.auth was undefined

How a single misplaced app.use() can disable JWT authentication

If you’re using Node.js, Express.js, JWT, cookies, or Google OAuth, this is a mistake you’ll want to avoid.

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