[Solved] Identify the error in this ExceptionMappingInterceptor code: intercept(context, next) { return next.handle().pipe( catchError(err => { throw new HttpException('Error occurred', 400); }), ); } | NestJS

NestJS - Interceptors

Identify the error in this ExceptionMappingInterceptor code:

intercept(context, next) {
  return next.handle().pipe(
    catchError(err => {
      throw new HttpException('Error occurred', 400);
    }),
  );
}

ANo error; code is correct

BUsing throw inside catchError instead of returning an observable error

CIncorrect status code 400 instead of 500

DMissing import for HttpException

Step-by-Step Solution

Solution:

Step 1: Understand catchError usage
Inside catchError, you must return an observable error, not throw an error directly.
Step 2: Identify correct error handling
The code should return throwError(() => new HttpException(...)) instead of throwing.
Final Answer:
Using throw inside catchError instead of returning an observable error -> Option B
Quick Check:
catchError must return observable error, not throw [OK]

Quick Trick: Return throwError inside catchError, don't throw directly [OK]

Common Mistakes:

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