Agent skill · security · aiskillstore
api-jwt-authenticator
A conceptual skill for securing FastAPI REST APIs with JWT authentication
Why this skill is useful
Provides detailed implementation patterns for JWT authentication in FastAPI that the AI wouldn't reliably generate on its own.
What it needs
About 3k tokens when loaded. Last updated 2026-08-07. 405 stars on the source repository.
What this skill does
API JWT Authenticator Skill When to Use This Skill Use this conceptual skill when you need to implement secure JWT-based authentication for FastAPI REST APIs. This skill is appropriate for: Protecting API endpoints that require user authentication Enforcing user-specific access control (ensuring users can only access their own resources) Implementing stateless authentication in microservices Securing REST APIs with standard JWT token validation Adding role-based access control (RBAC) to API endpoints This skill should NOT be used for: Public APIs that don't require authentication APIs that use alternative authentication methods (OAuth, API keys, etc.) Simple applications where basic auth is sufficient Prerequisites Understanding of JWT (JSON Web Token) concepts FastAPI application framework knowledge Basic security principles and authentication patterns Environment for managing secret keys securely Conceptual Implementation Framework JWT Token Extraction Capability Extract JWT tokens from the Authorization header in the format "Bearer <token>" Handle malformed or missing authorization headers appropriately Validate the presence of the "Bearer" prefix in the header Token Validation Capability Validate JWT tokens using a shared secret key Verify token signature to ensure integrity Check token expiration (exp) claim to prevent usage of expired tokens Validate token issuer (iss) and audience (aud) claims when applicable User Identity Verification Capability Extract user identity information from the token payload Compare the user ID in the token with the requested resource Enforce access control rules based on user identity Ensure users can only access resources belonging to them Error Handling Capability Generate appropriate HTTP 401 Unauthorized responses for invalid tokens Generate HTTP 403 Forbidden responses for insufficient permissions Provide clear error messages without exposing sensitive information Log authentication failures for security monitoring Expected I …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills aiskillstore/api-jwt-authenticator