NestJS · Junior · Question 41 of 75

What can an interceptor do?

✓Correct answer: Run logic before and after the handler: transform the result, add logging or timing, cache responses, map errors
2Only check permissions
3Only validate input

Explanation

Interceptors wrap the handler call. next.handle() returns an RxJS Observable of the result that you can transform with operators like map.

Further reading

NestJS: Interceptors ↗

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