fastapi

The FastAPI skill enables developers to build secure, high-performance REST APIs and WebSocket services using the FastAPI framework. It focuses on best practices for authentication, input validation, and async programming patterns, ensuring applications are robust against common web vulnerabilities such as DoS attacks, injection risks, and improper validation. By providing a structured approach to implementing FastAPI applications, this skill helps teams maintain security, reliability, and performance across production-grade web services.

Key capabilities include Pydantic-based input validation, dependency injection, OAuth2, JWT, and API key authentication, as well as configuring security headers and strict CORS policies. The skill emphasizes rate limiting, async database integration, and WebSocket security, along with patterns for secure application setup and error handling. Developers are guided to follow test-driven development, performance-aware design, and secure-by-default principles, supported by recommended versions for FastAPI, Starlette, Pydantic, and Python. The provided code patterns demonstrate middleware for security headers, restrictive CORS configuration, and strong password validation.

This skill is ideal for backend developers, DevOps engineers, and security-conscious teams who need to create APIs that interact with databases, external services, or real-time communication channels. It is suitable for organizations handling sensitive user data or high-traffic services where security, validation, and performance are critical. Common use cases include user management systems, secure data APIs, and WebSocket-based real-time applications where ensuring proper authentication, input validation, and threat mitigation is essential.