NestJS Basics#7 - Exception Filters in NestJS

Take complete control of exceptions

Welcome to the Part 7 of NestJS Basics.

In the previous post, we looked at the in-built exception handling in NestJS. The main topics were as follows:

• Understanding the global exception filter

• How to throw standard exceptions?

• How to customize the exceptions for better control?

In-build exception handling is a pretty robust way of handling exceptions in NestJS without.

If you haven’t gone through it yet, you can check out the post on NestJS in-built exception handling below:

NestJS Basics#6 - Exception Handling in NestJS

In today’s post, I’m going to cover the NestJS Exception Filter, which is a much more flexible approach to handling exceptions.

The Plan

Here are the things we will cover in this post.

• What is an Exception Filter?

  • The role of generic interface

  • The catch() method

• How to create a Custom Exception Filter?

• Understanding the ArgumentsHost

• How to use the Custom Exception Filter?

  • method-level

  • controller-level

  • global

As usual, every step will be accompanied by appropriate code examples.

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