NestJS - Interceptors
Which RxJS operator is commonly used inside an ExceptionMappingInterceptor to handle errors?
Which RxJS operator is commonly used inside an ExceptionMappingInterceptor to handle errors?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Recall RxJS operators for error handling
ThecatchErroroperator is designed to catch errors in an observable stream.Step 2: Match operator to interceptor usage
ExceptionMappingInterceptor usescatchErrorto catch exceptions and transform them.Final Answer:
catchError -> Option DQuick Check:
RxJS error handling = catchError [OK]
Quick Trick: Use catchError to catch and transform errors in observables [OK]
Common Mistakes:
- Using map which transforms data but doesn't catch errors
- Confusing filter with error handling
- Using tap which is for side effects, not error catching
Master "Interceptors" in NestJS
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