Tutorials ASP.NET Core Web API Tutorial
Authentication and Authorization in Web APIs — Complete Guide
Authentication and Authorization in Web APIs — 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 137 of 175
Authentication and Authorization in Web APIs
Beginner ✓ → Intermediate ✓ → Advanced → Professional
Advanced · 3 — Security & patterns · ~10 min · Module 13: Security
What is this?
Authentication and Authorization in Web APIs protects ShopNest.API — passwords, tokens, encryption, CORS, and SSO flows for real users.
Why should you care?
Public APIs are scanned within hours of deploy. Auth mistakes are resume-ending in security reviews.
See it live — copy this example
Create a Web API (dotnet new webapi), paste the example, run dotnet run, test in Swagger.
[Authorize(Roles = "Admin")]
[HttpPost]
public Task<IActionResult> Refund(int orderId);Run Example »
This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.
What happened?
- Study the example, run dotnet run, and test in Swagger.
- Authentication and Authorization in Web APIs connects to earlier modules in this course.
Try it yourself
- Read what Authentication and Authorization in Web APIs means for ShopNest.API.
- Type the example — do not only copy-paste.
- Test in Swagger or Postman.
- 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
You understand Authentication and Authorization in Web APIs in plain language. You traced or ran working C# in ShopNest.API. Move on when you can teach this topic to a friend.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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