Coding⏱️ 3 min read📅 2026-06-04

How to Fix: Custom error class in TypeScript

Create a custom error class in TypeScript to provide better error handling and customized reporting.

Quick Answer: Use the 'extends' keyword to create a new class that inherits from the core Error class, then override its constructor and toString methods to include additional information.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🔧 Proven Troubleshooting Steps
  3. ✨ Wrapping Up

Creating a custom error class in TypeScript allows you to provide better error handling and customized reporting for your application. By extending the core Error class, you can create a new error class that includesadditional properties such as url, response, and body.

This approach is particularly useful when working with APIs or web services where HTTP requests are involved. With a custom error class, you can provide more informative error messages and better error handling mechanisms.

⚠️ Common Causes

  • The primary reason for creating a custom error class is to handle errors that occur during HTTP requests. This includes errors such as network failures, invalid responses, or server-side errors.
  • Another alternative reason is to improve the overall user experience by providing more informative error messages and better error handling mechanisms.

🔧 Proven Troubleshooting Steps

Creating a custom error class using TypeScript

  1. Step 1: First, import the Error class from the TypeScript core library. This will allow you to extend the core Error class and create your own custom error class.
  2. Step 2: Next, define a new class that extends the Error class. In this case, let's create an HttpRequestError class.
  3. Step 3: In the constructor of the HttpRequestError class, pass in the url, response, and body as parameters. This will allow you to store additional information about the error.
  4. Step 4: Finally, override the toString method to provide a customized error message that includes the url, response, and body.

Using a library like Axios to handle HTTP requests

  1. Step 1: Another approach is to use a library like Axios to handle HTTP requests. This will allow you to simplify your code and reduce the amount of error handling logic.
  2. Step 2: With Axios, you can create an instance of the HttpRequestError class and pass in the url, response, and body as parameters. The library will take care of the rest.

✨ Wrapping Up

In conclusion, creating a custom error class in TypeScript allows you to provide better error handling and customized reporting for your application. By extending the core Error class and using libraries like Axios, you can simplify your code and reduce the amount of error handling logic.

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