[Solved] What is the main reason middleware must call the next() function in NestJS? — Ans: To pass control to the next middleware or route handler | NestJS

NestJS - Middleware

What is the main reason middleware must call the next() function in NestJS?

ATo log the request details after the handler runs

BTo end the request and send a response immediately

CTo restart the request processing from the beginning

DTo pass control to the next middleware or route handler

Step-by-Step Solution

Solution:

Step 1: Understand next() function role
next() tells NestJS to continue processing the request to the next middleware or handler.
Step 2: Why calling next() is essential
Without next(), the request stops and the handler never runs, blocking the flow.
Final Answer:
To pass control to the next middleware or route handler -> Option D
Quick Check:
next() = Continue request flow [OK]

Quick Trick: Always call next() to continue request processing [OK]

Common Mistakes:

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