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oauth

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Implements OAuth 2.0/2.1 authorization flows in Fastify applications — configures authorization code with PKCE, client credentials, device flow, refresh token rotation, JWT validation, and token introspection/revocation endpoints. Use when setting up authentication, authorization, login flows, access tokens, API security, or securing Fastify routes with OAuth; also applies when troubleshooting token validation errors, mismatched redirect URIs, CSRF issues, scope problems, or RFC 6749/6750/7636/8252/8628 compliance questions.

skills/oauth/SKILL.md

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Oct 27, 2026
License
MIT

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## When to use

Use this skill when you need to:
- Implement or debug an OAuth 2.0/2.1 flow in a Fastify application
- Validate tokens, configure PKCE, or set up refresh token rotation
- Secure Fastify routes and plugins with access-control middleware
- Resolve RFC compliance questions or identify security anti-patterns

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## Step-by-step: Authorization Code + PKCE in Fastify

### 1. Install dependencies
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