Custom Exception

Understand the NestJS built-in exceptions and custom exceptions.

We'll cover the following...

The HttpException exception and other built-in exceptions
Custom exceptions
- Create DuplicateAddressException
- Enhance the custom exception

NestJS provides a set of built-in exceptions. These exceptions cover standard HTTP status codes, such as “404 Not Found,” “500 Internal Server Error,” etc. Sometimes, we might also need to create a custom exception for the specific needs of our application.

In this lesson, we’ll explore the built-in exceptions and learn how to implement custom exceptions to manage exceptions effectively.

The `HttpException` exception and other built-in exceptions

In the previous lesson, we used the built-in HttpException. The HttpException exception is handled by default in NestJS. If HttpException is thrown, it will be mapped to the appropriate HTTP response and returned to the client.

A HttpException exception ...

Introduction

NestJS Fundamentals

Connecting with REST: Building the Address Book App with NestJS

Understand the Basics of NestJS and RESTful APIs

Validation, Exception Handling, and Logging

Persist Data with TypeORM and MySQL

Serialization and Interceptors

Authentication and Authorization

Persist Data, Authentication, Validation, and Serialization

Testing

Deployment

Testing and Deployment

Conclusion

Appendix

Custom Exception

The `HttpException` exception and other built-in exceptions

Understand the Basics of NestJS and RESTful APIs

Persist Data, Authentication, Validation, and Serialization

Testing and Deployment

Custom Exception

The HttpException exception and other built-in exceptions

The `HttpException` exception and other built-in exceptions