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hedron

PyPI Python CI License: MIT

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>=0.16.0"
# or
uv add "hedron>=0.16.0"

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. Current train: 0.16.0 (Beta).

Quick start

from hedron import Hedron, Page, Text

app = Hedron(
    title="Demo",
    security="standard",
    session_secret="replace-in-production",
    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.

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