# identityserver-api-protection

> Claude/Codex skill by [@duendesoftware](https://omgskills.com/library/duendesoftware/index.md) · 9 stars · Updated 2026-10-16

Protecting APIs with Duende IdentityServer: JWT bearer authentication, reference token introspection, scope-based authorization, DPoP/mTLS proof-of-possession validation, local API authentication, and multi-audience scenarios.

Tags: ai-agents, claude, claude-code

## Install

```sh
git clone https://github.com/DuendeSoftware/duende-skills /tmp/duende-skills && ln -s /tmp/duende-skills/skills/identityserver-api-protection ~/.claude/skills/identityserver-api-protection
```

## From README

Protecting APIs with IdentityServer When to Use This Skill Configuring JWT bearer authentication in an ASP.NET Core API to validate tokens from IdentityServer Setting up reference token introspection with AddOAuth2Introspection Handling both JWT and reference tokens in the same API using ForwardReferenceToken Implementing scope-based authorization policies Validating Proof-of-Possession tokens (DPoP and mTLS cnf claim) Protecting APIs hosted in the same application as IdentityServer (local API authentication) Securing multi-audience API deployments Docs: https://docs.duendesoftware.com/identityserver/apis/ Core Concepts APIs are the resources that IdentityServer protects. Clients obtain access tokens from IdentityServer, then present those tokens to APIs. The API must validate the token and enforce authorization based on the token's claims (scopes, audience, subject, etc.).

## Links

- HTML page: https://omgskills.com/library/duendesoftware/duende-skills/skills/identityserver-api-protection/
- GitHub: https://github.com/DuendeSoftware/duende-skills
- Author: [@duendesoftware](https://omgskills.com/library/duendesoftware/index.md)

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