Types of Auth Commonly Implemented in ASP.NET Core Web APIs

 

Authentication Type	Usage

JWT Bearer

Most common for Web APIs

Azure AD OAuth2

Enterprise applications

OpenID Connect

External identity providers

API Key Authentication

Microservices, internal API

Certificate-based Authentication

Highly secure B2B connections

Basic Authentication

Legacy support

 JWT Implementation with full code
✔ Azure AD authentication setup
✔ API Key authentication custom handler
✔ Certificate Auth setup in ASP.NET Core
✔ Role & Policy based examples