[Solved] Identify the error in this functional middleware code: function auth(req, res, next) { if (!req.headers.authorization) { res.status(401).send('Unauthorized'); } next(); } | NestJS

NestJS - Middleware

Identify the error in this functional middleware code:

function auth(req, res, next) {
  if (!req.headers.authorization) {
    res.status(401).send('Unauthorized');
  }
  next();
}

Ares.status should be res.sendStatus

BMissing req parameter in function signature

Cnext() is called even after sending response, causing errors

DAuthorization header check is incorrect

Step-by-Step Solution

Solution:

Step 1: Analyze flow after sending response
If authorization header is missing, response is sent with 401, but next() is still called, which can cause errors by continuing the request cycle.
Step 2: Identify correct fix
To fix, add return before res.status(401).send(...) to stop execution or call next() only if authorized.
Final Answer:
next() is called even after sending response, causing errors -> Option C
Quick Check:
Call next() only if no response sent [OK]

Quick Trick: Don't call next() after sending response [OK]

Common Mistakes:

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