Differences Between FastAPI and Traditional API Frameworks: A Novice's Perspective

This article compares the core differences between FastAPI and traditional API frameworks (such as Flask). Traditional frameworks are lightweight and easy to get started with, but complex features require manual implementation (e.g., parameter validation, document generation), and they have weak synchronous blocking performance. FastAPI, on the other hand, automatically validates parameter types using Python type hints, eliminating the need for manual logic; it includes interactive documentation based on the OpenAPI specification (accessible via `/docs` for testing interfaces), eliminating the need for additional tools; it automatically validates data types and formats using Pydantic, with intuitive error prompts; it supports asynchronous non-blocking processing for high-concurrency requests; and its code is more concise (with dependency injection and automatic return models). In summary, FastAPI is suitable for rapid development and high-concurrency scenarios, while traditional frameworks are better for simple projects. Beginners are advised to prioritize learning FastAPI to balance efficiency and skill development.