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Interceptors

1. What is an interceptor in NestJS and what can it do that guards and middleware cannot?

Level: Expert | Frequency: High

2. How do you use an interceptor to transform every response into a standard envelope format in NestJS?

Level: Expert | Frequency: High

3. How do you implement a caching interceptor that short-circuits the handler in NestJS?

Level: Expert | Frequency: High

4. What is the difference between tap(), map(), and catchError() in an interceptor's RxJS pipeline?

Level: Expert | Frequency: High

5. How do interceptors handle errors vs exception filters in NestJS — what is the division of responsibility?

Level: Expert | Frequency: High

6. How would you implement a request-scoped audit log interceptor that captures both the request and response body in NestJS?

Level: Expert | Frequency: High

All Topics

BasicsModulesDecoratorsControllersDependency InjectionProvidersArchitectureRequest LifecycleMiddlewareGuardsInterceptorsPipesFiltersException HandlingAPI DesignGraphQLDatabase and ORMMicroservicesAuthentication and Authorization,Interceptors