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I Really like Middleware in NodeJs/Express.

Published at

1/11/2025

Categories

middleware

node

express

Author

steve_adolf_c8df300913217

Main Article

https://dev.to/steve_adolf_c8df300913217/i-really-like-middleware-in-nodejsexpress-14hk

Categories

3 categories in total

Author

25 person written this

steve_adolf_c8df300913217

I Really like Middleware in NodeJs/Express.

Middleware to attach a user to the request object because nodejs/express does not do that for you out of the box.

Say i have a controller that need to check whether a user is of certain role in order to let them access a certain resource. Then this middleware will be helpful as it makes a user available to this function. Then i can do something like user.role === <some_role> ? do_something: do_this

Here is how i might implement it.

/**
 * @param {Request} req
 * @param {Response} res
 */
const userIsAuthenticatedMiddleware = async (req, res, next) => {
  const token = req.headers["authorization"]?.split(" ")[1];
  if (!token) return res.status(401).json({ message: "Access denied" });

  try {
    jwt.verify(token, process.env.JWT_SECRET, (error, user) => {
      if (error) return res.status(401).json({ message: "Wrong token" });
      req.user = user;
      next();
    });
  } catch (error) {
    return res.status(500).json({ message: "Internal Server Error" });
  }
};

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