The implementation of Typescript in Express does not rely on Middleware

I've encountered an issue with my Auth Middleware - it seems that the middleware isn't being called at all. Even when I intentionally throw an Error within the middleware function, nothing is printed out.

For testing purposes, I only need to invoke the auth middleware on a specific route:

Here's a snippet from my UserRoutes.ts file:

import auth from '../middleware/auth';

export default class UserRoutes {

  public UserController: UserController = new UserController();

  public routes(app: Application): void {
    // ...
    app.route('/api/users/me')
      .get(this.UserController.me, auth); // calling the auth middleware here
}

Within my middleware, I am trimming the Bearer Space and attempting to identify the user associated with the token retrieved after logging in. The tokens are successfully stored in my mongodb.

This is how my auth middleware is structured:

const auth = async (req: IUserRequest, res: Response, next: NextFunction) => {
  const token = req.header('Authorization').replace('Bearer ', '');
  const msg = { auth: false, message: 'No token provided.' };

  if (!token) res.status(500).send(msg);

  try {
    const data: any = jwt.verify(token, JWT_KEY);
    const user = await User.findOne({ _id: data._id, 'tokens.token': token });

    if (!user) {
      throw new Error("Could not find User");
    }

    req.user = user;
    req.token = token;
    next();
  } catch (error) {
    res.status(401).send({ error: 'Not authorized to access this resource.' });
  }
}

export default auth;

And here's a glimpse of UserController.ts:

export class UserController {
   ///...
   public me(req: IUserRequest, res: Response) {
     res.send(req.user)
   }
}

Answer №1

It seems that the me method being the initial handler called is causing it to send a response and terminate all processing. This means that no other routes will be processed. In order for a middleware to act as intended and allow other routes to continue execution, it must:

  1. Avoid sending a response, as doing so would render subsequent routes redundant since only one response can be sent per request.
  2. Invoke next(), which is the third argument provided (not yet declared in your code) when it has completed its tasks and wants routing to proceed.

Due to the fact that me() halts all routing, your auth() handler never gets triggered. Is it possible that you meant to have the auth() handler come before the me() handler? Remember, routes are processed in the order they are defined in the code (assuming they match the current incoming URL).

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