Display the Error
Let’s examine a scenario where a user attempts to access a resource that requires authentication. We’ll demonstrate the problem by using default error classes and observing the resulting error message.
Javascript
import { Request, Response } from 'express'; // Example route handler function getProtectedResource(req: Request, res: Response) { if (!req.user) { throw new Error('Authentication required!'); } // Retrieve and send the protected resource res.json({ resource: 'Some sensitive data' }); } |
When an unauthenticated user makes a request to this route, the server throws a generic Error with the message “Authentication required!”.
Output (Error):
Output
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.
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