Does it include CORS troubleshooting?

Yes, it provides standard middleware configurations and logging patterns to diagnose origin mismatches and preflight OPTIONS request failures in the browser.

How does this skill help with 422 Unprocessable Entity errors?

It provides structured steps to inspect Pydantic models, validate data types, and implement Optional fields to resolve schema mismatches between requests and models.

Is it compatible with Uvicorn and VS Code?

Yes, it includes specific configurations for Uvicorn log levels and VS Code launch.json templates to enable seamless interactive debugging sessions.

Will this help with database connection leaks?

It offers best practices for SQLAlchemy and database session management using FastAPI's dependency injection system to ensure connections are always closed or rolled back.

Can it fix async blocking issues in FastAPI?

Yes, it identifies synchronous I/O or time.sleep() calls inside async functions and suggests non-blocking alternatives like asyncio.sleep or using standard def for threadpool execution.

FastAPI Debugging Specialist

Name: FastAPI Debugging Specialist
Author: SnakeO

bySnakeO

API Development

Debugs and resolves FastAPI application issues including async/await errors, Pydantic validation failures, and dependency injection bottlenecks.

About

This skill provides a comprehensive, four-phase methodology for troubleshooting FastAPI applications, addressing the specific complexities of Starlette and Pydantic integrations. It guides users through resolving common but tricky issues such as 422 Unprocessable Entity errors, async event loop blocking, CORS configuration mishaps, and database session management. Whether you are facing circular imports on startup or unhandled 500 errors in production, this skill offers structured patterns and code-level examples to identify root causes and implement production-ready fixes using tools like Uvicorn logging, pdb, and custom middleware.

Key Features

Systematic resolution of Pydantic validation and 422 errors
Integrated guidance for using Uvicorn, pdb, and logging tools
0 GitHub stars
Optimization of async/await patterns and event loop performance
Secure CORS configuration and database session management patterns
Advanced troubleshooting for FastAPI dependency injection and middleware

Use Cases

Resolving circular dependency and import errors in large FastAPI projects
Fixing 'Unprocessable Entity' errors in complex Pydantic models
Debugging race conditions or blocking calls in asynchronous endpoints

About

Key Features

Systematic resolution of Pydantic validation and 422 errors
Integrated guidance for using Uvicorn, pdb, and logging tools
0 GitHub stars
Optimization of async/await patterns and event loop performance
Secure CORS configuration and database session management patterns
Advanced troubleshooting for FastAPI dependency injection and middleware

Use Cases

Resolving circular dependency and import errors in large FastAPI projects
Fixing 'Unprocessable Entity' errors in complex Pydantic models
Debugging race conditions or blocking calls in asynchronous endpoints