Create a JupyterLite archive that can be used offline

It is possible to create a fully self-contained JupyterLite archive with no request to external services.

Configure the Pyodide kernel

By default the Pyodide files are fetched from a CDN.

The full Pyodide distribution can be pretty heavy (~180MB), but it’s possible to self-host it.

Use the --pyodide flag to specify the Pyodide distribution you would like to use. For example:

jupyter lite build --pyodide https://github.com/pyodide/pyodide/releases/download/0.22.1/pyodide-0.22.1.tar.bz2

Warning

Generally, a version of pyodide_kernel is likely only compatible with variants of the same x.y.z version against which the release was tested, as both python and JS APIs are still changing frequently on both sides of the dependency.

Configure the piplite wheels

By default calling %pip install or piplite.install() downloads and installs packages from the public PyPI.

Instead you can configure a list of packages that will be downloaded at build time so they can be hosted alongside your JupyterLite website.

See Ship additional Pyodide wheels at build time for more information.

Concretely that means populating a list of URLs for downloading wheels. A good example for this is the configuration used for the JupyterLite demo website: jupyter_lite_config.json

The relevant part of jupyter_lite_config.json is the piplite_urls list which looks like the following:

{
  "PipliteAddon": {
    "piplite_urls": [
      "https://files.pythonhosted.org/packages/e6/0b/24795939622d60f4b453aa7040f23c6a6f8b44c7c026c3b42d9842e6cc31/fastjsonschema-2.15.3-py3-none-any.whl",
      "https://files.pythonhosted.org/packages/py2.py3/a/asttokens/asttokens-2.0.5-py2.py3-none-any.whl",
      "https://files.pythonhosted.org/packages/py2.py3/b/backcall/backcall-0.2.0-py2.py3-none-any.whl",
      "https://files.pythonhosted.org/packages/py2.py3/b/bqplot/bqplot-0.12.33-py2.py3-none-any.whl",
      "https://files.pythonhosted.org/packages/py2.py3/c/certifi/certifi-2021.10.8-py2.py3-none-any.whl",
      "https://files.pythonhosted.org/packages/py2.py3/d/defusedxml/defusedxml-0.7.1-py2.py3-none-any.whl",
      "https://files.pythonhosted.org/packages/py2.py3/e/executing/executing-0.8.3-py2.py3-none-any.whl",
      "..."
    ]
  }
}

Tweak this list based on the packages you would like to serve statically.

Offline Progressive Web App (PWA)

JupyterLite can be used as a Progressive Web App (PWA) on mobile devices, but also on desktop.

When JupyterLite is configured to work offline as detailed in this guide, it should be possible to use JupyterLite as a PWA without any network connection. There might still be a need for using the app while still connected to the Internet first, so the underlying Service Worker can cache the assets.

Check out the Using guide for more details on how to install JupyterLite as an application.

Reference

Check out the CLI Reference for more details.