"Troubleshooting with Express.js: Why isn't the route-level middleware getting invoked

Currently, I am facing an issue with my Express.js and TypeScript API. Although the API is working smoothly, it seems that the middleware is not being triggered. The routing requests are successfully passed to the handler without involving the middleware at all.

Below is how the routes are defined:

class TagsRoute implements Routes {
    public path = '/tags';
    public router = Router();
    public tagsController = new TagsController();

    constructor() {
        this.initializeRoutes();
    }

    private initializeRoutes() {
        this.router.get(`${this.path}`, this.tagsController.getTagPosts);
        this.router.get(`${this.path}/read`, this.tagsController.getTags);
        this.router.post(`${this.path}`, authMiddleware, this.tagsController.addTag);
        this.router.delete(`${this.path}`, authMiddleware, this.tagsController.deleteTag);
        this.router.put(`${this.path}`, authMiddleware, this.tagsController.editTag);
    }
}

export default TagsRoute;

The middleware definition is as follows:

const authMiddleware = (error: HttpException, req: Request, res: Response, next: NextFunction): void => {
    try {
        if (
            req.headers.authorization &&
            req.headers.authorization.split(' ')[0] === 'Bearer'
        ) {
            const token = req.headers.authorization.split(' ')[1];

            admin.initializeApp({
                credential: admin.credential.applicationDefault(),
            });

            getAuth()
                .verifyIdToken(token)
                .then((decodedToken) => {
                    if (!decodedToken || decodedToken.exp < Date.now()) {
                        res.status(401).json({ message: "Invalid token" });
                    }
                    next()
                })
                .catch((error) => {
                    res.status(401).json({message: "Invalid token"});
                });
        }
    } catch (error) {
        next(error);
    }
};

export default authMiddleware;

Answer №1

The main purpose of the authMiddleware function is to serve as error-handling middleware, according to its first argument. This means it will only be invoked if an error has occurred previously and been passed along with next(error).

However, upon reviewing the implementation of authMiddleware, it appears that the error argument may not actually be necessary. Therefore, you can simplify the function by removing this unnecessary parameter:

const authMiddleware = (req: Request, res: Response, next: NextFunction): void => {
 ...
};

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