hedron-notebook

Server-side notebook preview helper for Hedron.

Run a normal Hedron ASGI app from an authoring notebook with inline iframe and external-link modes. Distinct from the browser-Python / JupyterLite sandbox in hedron-extras. Install as hedron-notebook or via hedron[notebook].

Package maturity: Beta tooling-grade (0.1.x) · pin >=0.1.0,<0.2 (localhost preview only)

Default guidance is localhost-only development. Hosted or publicly reachable hosts raise an explicit warning. Preview URLs include an unguessable session token (hedron_preview_token query parameter). The first successful request seeds an HttpOnly cookie so iframe follow-up requests (assets, HTMX, WebSockets) stay authorized; X-Hedron-Preview-Token is also accepted. Requests without a matching token are rejected. This package is not a Supported production server.

Install

pip install "hedron-notebook>=0.2.3,<0.3"  # requires Hedron and core >=1.0.0,<2.0
# or
uv add "hedron-notebook>=0.1.0,<0.2"
# via flagship extra:
pip install "hedron[notebook]>=1.0.0,<1.1"

Requires Python 3.10–3.14.

Optional server extra (uvicorn):

pip install "hedron-notebook[server]>=0.2.3,<0.3"

Quick start

from hedron import Hedron, Page, Text
from hedron_notebook import start_preview

app = Hedron(
    title="Notebook demo",
    security="standard",
    session_secret="dev-only",
    explorer="off",
)


@app.page("/")
def home() -> Page:
    return Page(Text("Hello from a notebook preview"), title="Demo")


preview = start_preview(app)
print(preview.url)
# In a Jupyter cell:
# display HTML with preview.iframe_html()
preview.shutdown()

Public API

Links

• Package docs
• What’s ready
• Changelog
• Source
• Issues
• hedron

License

MIT. See the repository license.