Solution Approach
To address the problem, we can implement custom error classes in TypeScript. These classes allow us to define specific error types that extend the base Error class, providing additional information and enhancing error handling.
Let’s create a custom error class called AuthenticationError for our scenario:
Javascript
class AuthenticationError extends Error { constructor() { super('Authentication required!'); this.name = 'AuthenticationError'; } } |
Now, we can modify our route handler to throw an instance of AuthenticationError instead of a generic Error:
Javascript
function getProtectedResource(req: Request, res: Response) { if (!req.user) { throw new AuthenticationError(); } // Retrieve and send the protected resource res.json({ resource: 'Some sensitive data' }); } |
By using a custom error class, we provide more specific information about the encountered issue, making it easier to understand and handle the error.
Output (Desired):
Output
In the desired output, the error message now includes the name of the custom error class (AuthenticationError), making it clear what type of error occurred. This improved clarity aids in debugging and enables developers to address issues more effectively.
TypeScript Custom Errors in RESTful API
In this article, we will explore the importance of using custom error handling in TypeScript for RESTful APIs. We will begin by highlighting the problem statement, followed by demonstrating the problem with code examples and error outputs. Finally, we will present a solution approach using custom error classes and showcase the desired output. By the end, you will have a clear understanding of how to implement custom errors to improve error handling in your TypeScript-based RESTful APIs.