Questions
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1What are the two ways to register a global exception filter in NestJS and what is the key difference?
2How do you handle exceptions differently in a filter depending on whether the request is HTTP, WebSocket, or RPC?
3What does the @Catch() decorator do and what happens when you omit its argument?
4How do you register multiple global filters that each handle a different exception type in NestJS?
5How do you prevent sensitive information from leaking through exception responses in production NestJS apps?
6How do you create a domain-specific custom exception class in NestJS?
7How do you extend the built-in BaseExceptionFilter to add logging while keeping default NestJS behaviour?
8How does exception filter resolution order work when multiple filters are registered at different levels in NestJS?
9How do you write an exception filter that handles GraphQL errors differently from REST errors in NestJS?
10How do you add custom response headers or set cookies inside an exception filter in NestJS?
11How do you re-throw an exception from within a filter to let a higher-scoped filter handle it in NestJS?
12How do you integrate a third-party error tracker like Sentry inside a global exception filter in NestJS?
13How do you handle async operations inside an exception filter in NestJS, for example logging to a database?
14What is HttpException in NestJS and what two arguments does its constructor take?
15What built-in HTTP exceptions does NestJS provide out of the box?
16How do you apply an exception filter at the method, controller, and global level in NestJS?
17What interface must an exception filter implement and what are the two parameters of catch()?
18How do you implement a filter that adds a request correlation ID to every error response in NestJS?
19What is the cause option on HttpException and how should you use it for error tracing?
20How do interceptors and exception filters divide error-handling responsibility in NestJS?
21How do getResponse() and getStatus() work on an HttpException and what can getResponse() return?
22How do you map database and ORM exceptions to HTTP exceptions using a global filter in NestJS?
23How do you unit test an exception filter in NestJS?
24What does NestJS's built-in global exception layer do when no custom filter is registered?
25How do you write a production-ready global all-exceptions filter that handles HttpException and unexpected errors differently?
