[Solved] Why does this global middleware fail to execute properly in NestJS?export class CheckMiddleware { use(req, res) { console.log('Checking request'); next(); } } app.use(CheckMiddleware); | NestJS

NestJS - Middleware

Why does this global middleware fail to execute properly in NestJS?

export class CheckMiddleware {
  use(req, res) {
    console.log('Checking request');
    next();
  }
}

app.use(CheckMiddleware);

AMiddleware must be applied inside a module, not in main.ts

BMiddleware classes cannot be used with app.use()

CThe console.log statement is incorrect syntax

DThe middleware's use method is missing the next parameter

Step-by-Step Solution

Solution:

Step 1: Check method signature
The use method must accept three parameters: req, res, next.
Step 2: Identify missing parameter
Here, next is called but not declared as a parameter, causing a runtime error.
Final Answer:
The middleware's use method is missing the next parameter -> Option D
Quick Check:
Middleware must declare next to call it [OK]

Quick Trick: Always include next parameter in middleware use method [OK]

Common Mistakes:

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Why does this global middleware fail to execute properly in NestJS?