How can NestJS middleware add custom properties to the request object so that downstream handlers can access them?

hard📝 Application Q9 of 15

NestJS - Middleware

ABy attaching new properties directly to the req object inside middleware

BBy modifying the response object instead of the request

CBy returning a new request object from middleware

DBy calling next() with additional arguments

Step-by-Step Solution

Solution:

Step 1: Understand request object mutability
The req object is mutable and shared through middleware and handlers.
Step 2: Add properties directly
Middleware can add custom fields like req.user or req.timestamp.
Final Answer:
By attaching new properties directly to the req object inside middleware -> Option A
Quick Check:
Modify req object to pass data downstream [OK]

Quick Trick: Add properties directly to req object [OK]

Common Mistakes:

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