JupyterLab Server sits between JupyterLab and Jupyter Server, and provides a set of REST API handlers and utilities that are used by JupyterLab. It is a separate project in order to accommodate creating JupyterLab-like applications from a more limited scope.
pip install jupyterlab_server
See the full documentation for API docs and REST endpoint descriptions.
Subclass the LabServerApp and provide additional traits and handlers as appropriate for your application.
Please see CONTRIBUTING.md for details.