config.json

{
  "language": "Emacs Lisp",
  "slug": "emacs-lisp",
  "active": true,
  "blurb": "Emacs Lisp is the extension language of the Emacs text editor. You can easily create you own extensions, which include preference files, but also full-fledged applications that use Emacs as a running environment in a fully integrated way.",
  "version": 3,
  "online_editor": {
    "indent_style": "space",
    "indent_size": 2
  },
  "exercises": {
    "concept": [],
    "practice": []
  }
}