node.js - Using req.user with JWT make my app crash with express.js and Nodemon - Stack Overflow

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I have a problem since yesterday and I still don't figured it out after many hours passed to try many solutions.

I'm building an app using Typescript with Express.js and I'm using nodemon server to launch the node server while coding.

Everything worked fine until I tried to implement a route which need a req.user.id (I isolated the problem and using req.user anywhere in my code make nodemon crash with the following message : "[nodemon] app crashed - waiting for file changes before starting..."

Here is details of the problematic code :

in src/controllers/profileControllers.ts (this is a simple function for test but the error is still here) :

export const testUserProperty = async (req: Request, res: Response) => {
    try {

      if (!req.user || !req.user.id) {
        return res.status(401).json({ error: 'Utilisateur non authentifié.' });
      }
      const userId = req.user.id;
      const user: IUser | null = await User.findById(userId).select('-password');
      if (!user) {
        return res.status(404).json({ error: 'Utilisateur non trouvé.' });
      }
      res.status(200).json(user);
    } catch (error) {
      res.status(500).json({ error: 'Erreur lors de la récupération du profil.' });
    }
  };

with this route in src/routes/profileRoutes.ts : router.get('/profile', authenticate, testUserProperty); and the rights imports in each files.

in my login function in src/controllers/authController.ts I have this token generation :

    const token = jwt.sign(
        { userId: user._id, email: user.email },
        process.env.JWT_SECRET as string,
        { expiresIn: "1h" }
    );

so there is well userId and email.

So here is my authenticate function in src/middlewares/authMiddleware.ts :

export const authenticate = (req: Request, res: Response, next: NextFunction) => {
    const authHeader = req.header("Authorization");
    const token = authHeader && authHeader.split(" ")[1];
    if (!token) {
        return res.status(401).json({ message: "Accès refusé, token manquant." });
    }

    try {
        const decoded = jwt.verify(token, process.env.JWT_SECRET as string) as { userId: string, email: string };
        req.user = { id: decoded.userId, email: decoded.email };

        if (!req.user || !req.user.id) {
            return res.status(401).json({ error: 'Utilisateur non authentifié.' });
          }

        next();
    } catch (error) {
        res.status(401).json({ error: "Token invalide" });
    }
};

Is there errors in this ? Everything seems to be correct for me, I have review it many times and modified things for testing, I even ask GPT 4o and even GPT o3_mini_high with every details I could share with them to help finding the error and they didn't figure it out...

This is typescript so I obviously have a types folder with global.d.ts in it with this content :

declare namespace Express {
    export interface Request {
      user?: {
        id: string;
        email: string;
      };
    }
  }

and of course I have "include": ["src", "types"] in tsconfig.json.

I tried to use an Interface that Extends Request directly in the controller but I still had the error... nodemon invariably crash with error [nodemon] app crashed - waiting for file changes before starting... when I use req.user.

I tried to replace every req.user with req.body.user just for testing and the nodemon server run perfectly so the problem is definitely linked to the use of req.user.

So I finally post this question here, maybe someone here will help me find new avenues of research to find where this bug comes from?

Thank you very much if you help me and don't hesitate to ask me if you need more informations, or comment if you have the same problem so we can look for a solution together.

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