hedron
FastAPI-native typed component framework for HTML and HTMX.
Builds on framework-neutral hedron-core
with pages, addressable components, typed actions, CSRF-aware forms, OpenAPI
text/html metadata, interaction built-ins (Lazy, Poll, Pagination, …),
caching (cache_data / cache_component), utility UI, ColorMode persistence,
a thin Hedron() application facade, CLI (new/check/graph/build/…),
plugin loader, and public hedron.testing helpers.
Install
pip install hedron
# or
uv add hedron
Optional data and charts:
pip install "hedron[data]"
pip install "hedron[charts]"
Development Explorer:
pip install "hedron[dev]"
Optional browser testing extras:
pip install "hedron[browser]"
Requires Python 3.11, 3.12, 3.13, or 3.14.
Quick start
from hedron import Hedron, Page, Text
app = Hedron(
title="Demo",
security="standard",
session_secret="replace-me",
explorer="off",
)
@app.page("/")
def home() -> Page:
return Page(Text("Hello, Hedron"), title="Demo")
Plain FastAPI without the Hedron subclass:
from fastapi import FastAPI
from hedron import HTML, HedronRouter, Text, hedron_response, mount_hedron_static
from hedron.security.policy import SecurityPolicy
app = FastAPI()
app.state.hedron_security = SecurityPolicy.from_name("standard")
mount_hedron_static(app)
router = HedronRouter()
@router.get("/card", **hedron_response())
def card():
return HTML(Text("plain"))
app.include_router(router)
CLI inspection (optionally load an app module first):
hedron new demoapp
cd demoapp
hedron --app app:app routes
hedron --app app:app components
hedron --app app:app preview home
hedron check --format json --severity error
hedron graph
hedron audit-components
Links
License
MIT. See LICENSE.
1 maintainer
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