TOPIC OVERVIEW

NestJS/Exception Handling

Build APIs that fail predictably and return useful errors instead of confusing server responses.

15 QuestionsIntermediateHigh Priority ~10 min read

Applications will eventually encounter errors, whether a user sends invalid data, a resource does not exist, or a database operation fails. NestJS provides built-in HTTP exceptions and a standard exception handling system so these failures can be turned into meaningful responses.

Good exception handling is about more than catching errors. You need to decide which errors should be exposed to clients, how responses should be structured, and where unexpected errors should be logged without leaking sensitive implementation details.

What you'll walk away knowing

How NestJS built-in HTTP exceptions work

How to create and throw custom exceptions

How exception filters customize error responses

How to handle unexpected errors safely

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

All Topics

1

Dependency Injection

2

Request Lifecycle

Exception Handling

3

4

Database and ORM

5

Authentication and Authorization

Sharethis topic

Share via WhatsApp, X, Facebook, LinkedIn or copy link. Open Graph preview enabled.