CODEWITHSUNDEEP
nestjs
Vikram Babu Nagineni
Vikram Babu Nagineni

Reputation: 3549

When to use ExceptionFilter vs BaseExceptionFilter in NestJS?

What is the diff b/w both types of filters. And when to use what? Please explain with any example

@Catch(HttpException)
export class HttpExceptionFilter implements ExceptionFilter {

}

@Catch()
export class AllExceptionsFilter extends BaseExceptionFilter {

}

Upvotes: 6

Views: 2190

Answers (1)

Jay McDoniel
Jay McDoniel

Reputation: 70131

ExceptionFilter is an interface that defines that the current class should implement the catch method with the signature (exception: unknown, host: ArgumentHost).

BaseExceptionFilter is a class already made in NestJS with a working catch method. By using extend you can add your own logic to catch and then in the end of the implementation call super.catch(exception, host) and let Nest take care of the rest from there.

The main difference of the two is how much of the logic do you want to write vs how much do you want to add in. If you are happy with how Nest already handles errors, and just want to add in the ability to log your errors, say to a database, then extends BaseExceptionFilter is a good fit. However, if you don't care or how Nest's exception filter works by default, then implements ExceptionFilter and writing your own custom logic is the way to go.

Upvotes: 8

Related Questions