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

All Topics

1

Dependency Injection

2

Request Lifecycle

Exception Handling

3

4

Database and ORM

5

Authentication and Authorization