<ul data-eligibleForWebStory="true">FastAPI is a modern Python web framework that simplifies development challenges.It comes with built-in features, speed comparable to Express.js, error prevention, and auto documentation.FastAPI handles automatic data validation, path parameters, async support, and more.It offers a structured approach to middleware, has a steeper learning curve than Express.js.Transition tips include embracing Python types, understanding async, and utilizing key resources.