Tutorials ASP.NET Core Web API Tutorial
403 HTTP Status Code in ASP.NET Core Web API — Complete Guide
403 HTTP Status Code in ASP.NET Core Web API — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of ASP.NET Core Web API Tutorial on Toolliyo Academy.
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ASP.NET Core Web API Tutorial · Lesson 47 of 175
403 HTTP Status Code in ASP.NET Core Web API
Beginner ✓ → Intermediate → Advanced → Professional
Intermediate · 2 — Data & pipeline · ~6 min · Module 4: Return Types and Status Codes
What is this?
403 Forbidden tells the client: authenticated but not allowed. ASP.NET Core returns it with Ok(), Created(), NotFound(), StatusCode(403), and similar helpers.
Why should you care?
Mobile and SPA clients branch on status codes — not English messages. Wrong codes break retry logic and confuse Postman tests.
See it live — copy this example
Create a Web API (dotnet new webapi), paste the example, run dotnet run, test in Swagger.
return StatusCode(403); // ForbiddenRun Example »
This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.
What happened?
- Do not retry without different role
- Follow the practice steps below on ShopNest.API — typing code yourself is the fastest way to learn.
Try it yourself
- Trigger a 403 response in ShopNest.API (Swagger or Postman).
- Inspect status line and response body in the Network tab.
- Compare with the lesson on 400 — note the difference.
- Change a route URL or DTO property and save — test again in Swagger or curl.
- Return the wrong status code on purpose (404 instead of 200) and see what the client shows.
Remember
403 = Forbidden. Use the right helper method in ControllerBase. Clients depend on the number, not your message text.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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