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If your project heavily relies on async patterns, FastAPI is the better fit."},{"question":"Which has better documentation?","answer":"Flask has more third-party tutorials due to age and popularity. FastAPI generates interactive API documentation automatically (Swagger UI + ReDoc), eliminating manual docs work. For API documentation, FastAPI wins. For general learning resources, Flask has more available due to its 15-year head start."},{"question":"What's the migration path from Flask to FastAPI?","answer":"There's no direct upgrade path. Migration requires rewriting your application, though logic often transfers cleanly. Many teams run both frameworks simultaneously in a microservices architecture. 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