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Answer

How to Implement JWT Authentication in ASP.NET Core Web API?

🔹 Title:

How to Implement JWT Authentication in ASP.NET Core Web API?

🔹 Technology:

C#, ASP.NET Core, Web API, JWT

🔹 Description:

I am a beginner in ASP.NET Core and currently learning how to build secure Web APIs. I want to implement JWT (JSON Web Token) based authentication in my project.

I would like to understand the complete flow of authentication, including token generation, validation, and securing API endpoints.

🔹 What I Tried:

I created a basic API project and tried adding authentication services, but I am confused about how to properly configure JWT and use it in controllers.

🔹 Code:

builder.Services.AddAuthentication();

🔹 Error / Issue:

No specific error, but I am unable to understand how to generate and validate JWT tokens properly.

🔹 Expected Result:

I want to successfully implement JWT authentication so that only authorized users can access protected API endpoints.

🔹 Environment:

- .NET 6 / .NET 7

- Visual Studio

🔹 Additional Info:

Any step-by-step guidance or simple example would be very helpful.