FastHTML is a web framework for creating interactive applications using an HTML-first approach. It combines familiar web technologies with a concise programming interface, allowing developers to construct web pages and application components directly in Python.
The framework emphasizes server-rendered HTML rather than complex client-side application architectures. It uses HTMX to update sections of a page in response to user interactions, reducing the need to write custom JavaScript.
FastHTML builds on established technologies including Starlette and Uvicorn. Its design gives developers direct control over HTML and HTTP while providing abstractions that simplify common web development tasks.
This is free and open source software.
Key Features
- HTML-first architecture for building server-rendered web applications.
- HTMX integration enables interactive interfaces through partial HTML updates.
- Python functions represent HTML elements and reusable interface components.
- Decorator-based routing for handling HTTP requests.
- Automatic conversion of FastTags component trees into HTML responses.
- Support for reusable components combining HTML elements and application logic.
- Built on Starlette with ASGI support through Uvicorn.
- Beforeware provides request processing functionality before route handlers execute.
- Support for forms, request parameters, cookies, and session management.
- WebSocket support for real-time client-server communication.
- Automatic handling of complete HTML pages and partial responses.
- Compatible with conventional CSS frameworks and JavaScript libraries.
- Optional integration with SQLite databases through Fastlite.
- Support for custom HTTP responses, headers, and middleware.
- Can incorporate existing web components without requiring a client-side JavaScript framework.
Website: github.com/AnswerDotAI/fasthtml
Support:
Developer: Answer.AI, Jeremy Howard and contributors
License: Apache License 2.0
FastHTML is written in Python. Learn Python with our recommended free books and free tutorials.
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