[Solved] You wrote this NestJS middleware but requests never reach the handler. What is the problem? export function authMiddleware(req, res, next) { if (!req.headers.authorization) { res.status(401).... | NestJS

NestJS - Middleware

You wrote this NestJS middleware but requests never reach the handler. What is the problem?

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

AMiddleware must not send responses directly

BAuthorization header check is incorrect syntax

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

Dnext() should be called before checking headers

Step-by-Step Solution

Solution:

Step 1: Review middleware flow control
If authorization header is missing, response is sent but next() is still called, causing request to continue incorrectly.
Step 2: Fix flow by returning early
To stop processing after sending response, return immediately without calling next().
Final Answer:
next() is called even after sending response, causing errors -> Option C
Quick Check:
Don't call next() after sending response [OK]

Quick Trick: Return after sending response to avoid calling next() [OK]

Common Mistakes:

Calling next() after response ends
Not returning early to stop middleware
Misunderstanding middleware flow control

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More NestJS Quizzes

You wrote this NestJS middleware but requests never reach the handler. What is the problem?

Step 1: Review middleware flow control

Step 2: Fix flow by returning early

Final Answer:

Quick Check:

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