FastUI allows developers to create user interfaces through declarative Python code. This framework is especially useful for Python developers, as it allows them to build responsive web applications with React without having to write JavaScript or interact with npm.
It offers interface developers the advantage of focusing on creating reusable components, eliminating the need to duplicate components in different views.
The underlying principle of FastUI is separation of concerns, where the backend is responsible for defining the entire application and the frontend focuses solely on the user interface. This methodology guides the development process, ensuring that developers on both sides can work more efficiently and with a clearer focus on their areas.
FastUI is built on top of the Pydantic model and TypeScript interfaces, making it easy to define user interfaces that are validated at build time (using TypeScript and tools like pyright or mypy) and at runtime (using Pydantic). This ensures a high level of integrity and reliability in the user interface, making FastUI a tool for developers who want to improve the web application development workflow.
FastUI is a comprehensive set of tools designed to guide the development of user interfaces in web applications, spanning both the Python and JavaScript ecosystems. At its core, FastUI includes the fastui PyPI package, which contains Pydantic models for UI components and various utilities. This package is designed to integrate seamlessly with FastAPI, but maintains its independence, allowing compatibility with any Python web framework. This flexibility highlights FastUI’s usefulness in a variety of development environments, not limiting its application to FastAPI-based projects.
On the JavaScript side, FastUI extends its functionality through three npm packages: @pydantic/fastui, @pydantic/fastui-bootstrap and @pydantic/fastui-prebuilt. The @pydantic/fastui package provides a React TypeScript framework, allowing developers to leverage the core mechanics and types of FastUI while building custom components. For those looking for out-of-the-box solutions, @pydantic/fastui-bootstrap provides a set of Bootstrap styled components, facilitating rapid UI development without the need for extensive customization. Finally, the @pydantic/fastui-prebuilt package delivers a prebuilt version of the FastUI React app, available via the jsdelivr.com CDN, simplifying deployment by eliminating the need to install npm packages or build locally. Together, these packages provide a robust, flexible toolkit for developing sophisticated web interfaces with ease.