This is a simple test of the Gutenberg editor for WordPress. In most cases, it will be used in the context of a WordPress site. But can it be used in a standalone React app with no connection to WordPress at all? Sort of. Try it for yourself:
# Clone.
git clone git@github.com:noahtallen/headless-gutenberg.git
# Do the Node thing.
yarn
# Run the code.
yarn start
# Use the URL that command gives you to access the site.The <Editor /> component lives in src/editor.js if you wish to see how much setup this requires. (Not much, it turns out!)