Welcome to IdentityServer4¶
IdentityServer4 is an OpenID Connect and OAuth 2.0 framework for ASP.NET Core.
It enables the following features in your applications:
Authentication as a Service¶
Centralized login logic and workflow for all of your applications (web, native, mobile, services).
Single Sign-on / Sign-out¶
Single sign-on (and out) over multiple application types.
Access Control for APIs¶
Issue access tokens for APIs for various types of clients, e.g. server to server, web applications, SPAs and native/mobile apps.
Support for external identity providers like Azure Active Directory, Google, Facebook etc. This shields your applications from the details of how to connect to these external providers.
Focus on Customization¶
The most important part - many aspect of IdentityServer can be customized to fit your needs. Since IdentityServer is a framework and not a boxed product or a SaaS, you can write code to adapt the system the way it makes sense for your scenarios.