Learning to use a new technology and its architecture can be complicated by the jargon used to describe components. We provide this terminology guide to help smooth the learning the components.


  • Application - The main application object that hold the application shell, command registry, and keymap registry. It is provided to all plugins in their activate method.
  • Extension - an npm package containing one or more Plugins that can be used to extend JupyterLab’s functionality.
  • Plugin - An object that provides a service and or extends the application.
  • Lumino - The JavaScript library that provides the foundation of JupyterLab, enabling desktop-like applications in the browser.
  • Standalone example - An example in the examples/ directory that demonstrates the usage of one or more components of JupyterLab.
  • TypeScript - A statically typed language that compiles to JavaScript.