2023-08-30-flet-for-fastapi.md

slug	flet-for-fastapi
title	Flet for FastAPI
authors	feodor
tags	releases

We've just released Flet 0.10.0 with FastAPI support!

FastAPI coupled with Uvicorn, Hypercorn, Gunicorn or other web server replaces built-in Flet web server (Fletd) to reliably run production Flet workloads.

On the other hand, seasoned FastAPI developers can use Flet to easily add interactive, real-time dashboards and admin UI to their existing or new FastAPI services.

A minimal app example

import flet as ft
import flet.fastapi as flet_fastapi

async def main(page: ft.Page):
    await page.add_async(
        ft.Text("Hello, Flet!")
    )

app = flet_fastapi.app(main)

It's a simple app that just outputs "Hello, Flet!" on a web page.

To run the app install Flet for FastAPI and Uvicorn:

pip install flet
pip install uvicorn

Save the code above to hello.py and then start uvicorn as:

uvicorn hello:app

Open the browser and navigate to http://127.0.0.1:8000 to see the app running.

:::note Flet app must be async in order to work with FastAPI WebSocket handler. :::

Features and benefits

• Multiple Flet apps on a single domain - mapped to the root and/or sub-paths.
• Simple one-line mappings or individual endpoint configurations.
• Light-weight async wrapper around FastAPI WebSocket connection for greater concurrency.
• Serves Flet static files with user assets and app meta-information customization.
• Uploads handler for FilePicker control.
• OAuth callback handler for authentication flows.

Check the guide for complete information about Flet with FastAPI.

Let us know what you think by joining Flet Discord server or creating a new thread on Flet GitHub discussions.