skills.rest
ricardoroche
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fastapi-patterns

Enforces FastAPI endpoint patterns including dependency injection, authentication, validation, and error handling for API definitions.

2|Updated Nov 13, 2025
Search Tags:#error handling#middleware#OpenAPI#Pydantic#FastAPI#async#dependency injection#API development
One-click install
npx skills add https://github.com/ricardoroche/ricardos-claude-code --skill fastapi-patterns
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: fastapi-patterns
Source: https://github.com/ricardoroche/ricardos-claude-code/tree/main/.claude/skills/fastapi-patterns
Command: npx skills add https://github.com/ricardoroche/ricardos-claude-code --skill fastapi-patterns

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires fastapi, pydantic, httpx.

What problem does it solve?

This Skill enforces best practices for building APIs with FastAPI, addressing issues like inconsistent endpoint definitions, poor error handling, and lack of documentation. It ensures your APIs are well-structured, validated, secure, and easy to maintain, accelerating development and improving reliability.

Core Features & Use Cases

  • Router Organization: Guides on structuring APIs using APIRouter for modularity and clear resource separation.
  • Dependency Injection: Provides patterns for authentication, authorization, and service injection using Depends().
  • Request & Response Validation: Enforces Pydantic models for request bodies and response_model for consistent, validated API outputs.
  • Comprehensive Error Handling: Guides on converting service exceptions to HTTP exceptions and implementing global exception handlers for predictable error responses.
  • Async Operations & Middleware: Covers asynchronous I/O, background tasks, and custom middleware for logging and performance.
  • Use Case: A backend developer is creating a new user management API. This skill helps them define UserCreate and UserResponse Pydantic models, organize endpoints with APIRouter, implement get_current_user for authentication, and set up global error handling, ensuring a high-quality API.

Quick Start

Create a new FastAPI endpoint for creating a user, ensuring it uses a Pydantic request model and handles duplicate email errors.

Frequently Asked Questions about fastapi-patterns

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I structure FastAPI endpoints with consistent error handling and validation?▼

FastAPI endpoints should use Pydantic models for request validation, explicit status codes, and global exception handlers that convert service errors to HTTP responses. This ensures predictable, documented error behavior across your API while maintaining type safety.

What's the best way to organize FastAPI routers for a modular API?▼

Use APIRouter to group related endpoints by resource, then include routers in your main FastAPI app. This separates concerns, improves maintainability, and makes it easy to scale endpoints across multiple files and services.

How do I implement authentication and authorization in FastAPI using dependency injection?▼

Create reusable dependency functions with Depends() that extract and validate credentials, then apply them to endpoints requiring protection. This pattern centralizes auth logic, reduces duplication, and integrates seamlessly with OpenAPI documentation.

Can I use async operations and middleware in FastAPI for performance?▼

Yes. FastAPI natively supports async/await for I/O-bound operations, background tasks, and custom middleware for logging and performance monitoring. Async middleware processes requests before they reach handlers, enabling efficient request lifecycle management.

Does Pydantic work with FastAPI for both request and response validation?▼

Yes. Define Pydantic models for request bodies and use response_model on endpoints to validate outgoing data. This enforces schema consistency, auto-generates OpenAPI documentation, and catches serialization errors at the API boundary.

What should I do when endpoints need to handle service exceptions predictably?▼

Map domain exceptions to HTTP exceptions in global exception handlers, then FastAPI serializes them to client responses with correct status codes. This decouples business logic from HTTP concerns and ensures consistent error formats across endpoints.

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