Learn FASTAPI with Real Code Examples
Updated Nov 25, 2025
Practical Examples
Todo API with Pydantic validation
Blog backend with CRUD operations
Authentication API with JWT/OAuth2
E-commerce microservice backend
Machine learning model API serving predictions
Troubleshooting
Ensure Python version is compatible (3.7+)
Check virtual environment activation
Validate Pydantic model fields
Check port availability for Uvicorn
Monitor logs for startup or runtime errors
Testing Guide
Use Pytest for unit and integration testing
Test endpoints with Postman or HTTP client
Validate Pydantic model input/output
Mock database or external API calls
Automate tests in CI/CD pipelines
Deployment Options
Cloud platforms (AWS, Azure, GCP)
Docker containerization
Serverless with AWS Lambda + API Gateway
Uvicorn/Gunicorn for production deployment
Reverse proxy with Nginx
Tools Ecosystem
Python 3.9+ runtime
Uvicorn or Hypercorn ASGI servers
Postman/Insomnia for API testing
Pytest for testing
FastAPI extensions and plugins
Integrations
Databases (SQLAlchemy, Tortoise, MongoDB)
Authentication (OAuth2, JWT) libraries
Frontend frameworks (React, Vue, Angular)
Machine learning models (TensorFlow, PyTorch)
Caching (Redis, Memcached)
Productivity Tips
Use Pydantic models for consistent validation
Leverage dependency injection for reusable logic
Enable automatic docs to reduce manual work
Use async endpoints for high throughput
Automate testing and deployment pipelines
Challenges
Mastering async/await in Python
Writing accurate Pydantic models
Managing dependencies effectively
Scaling async APIs under load
Securing APIs with OAuth2/JWT