[Solved] Which of the following is the correct way to define a middleware class in NestJS? — Ans: class MyMiddleware { use(req, res, next) { next(); } } | NestJS

NestJS - Middleware

Which of the following is the correct way to define a middleware class in NestJS?

Aconst MyMiddleware = (req, res, next) => { next(); }

Bclass MyMiddleware { handle(req, res, next) { next(); } }

Cfunction MyMiddleware(req, res, next) { next(); }

Dclass MyMiddleware { use(req, res, next) { next(); } }

Step-by-Step Solution

Solution:

Step 1: Recall NestJS middleware pattern
Middleware must be a class with a method named use that takes req, res, next.
Step 2: Check options
Only class MyMiddleware { use(req, res, next) { next(); } } defines a class with a use method correctly. class MyMiddleware { handle(req, res, next) { next(); } } uses handle, which is invalid. Options C and D define functions, not classes.
Final Answer:
class MyMiddleware { use(req, res, next) { next(); } } -> Option D
Quick Check:
Middleware class must have use() method [OK]

Quick Trick: Middleware class must have a use() method [OK]

Common Mistakes:

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Which of the following is the correct way to define a middleware class in NestJS?