<ul><li>In 2025, securing ASP.NET Core APIs with OAuth2 and OpenID Connect (OIDC) is crucial as APIs are used in various applications.</li><li>OAuth2 is for authorization while OIDC is the identity layer based on OAuth2, working together to handle permissions and authenticate users.</li><li>Setup requires tools like .NET 6+, Microsoft.AspNetCore.Authentication.JwtBearer, and an Identity Provider (IdP) such as Azure AD or Auth0.</li><li>Configuration involves JWT authentication, protecting API endpoints with authorization attributes, and adding scopes and policies for secure access control.</li></ul>

Securing ASP.NET Core APIs with OAuth2 and OpenID Connect (2025 Edition)

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