Blog

Mert Özen's blog posts on software development, backend, frontend, and DevOps.

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.NET Core Web API 36 Angular 31 JavaScript Basics 19 JavaScript Intermediate 18 JavaScript Advanced 16 TypeScript Basics 14 TypeScript Intermediate 14 TypeScript Advanced 12

2 posts found #error-handling

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Backend PART 18

Global Error Handling in ASP.NET Core: Exception Middleware and ProblemDetails

Starting from the real response of an unhandled exception on .NET 6, we move to UseExceptionHandler with an error controller, then to our own middleware that maps domain exceptions to 404/409/500 ProblemDetails.

4 Nov 2026 9 min 1

Frontend PART 12

Error Handling in TypeScript: unknown in catch, Narrowing Errors and the Result Pattern

We look at why the catch variable is unknown, narrowing with instanceof Error, custom error classes, Promise pitfalls, and modeling errors with Result and discriminated unions.

3 Nov 2026 9 min 1