Install all dependencies with yarn (install yarn if you don't have).
Alternatively, use npm install.
Start the dev server with yarn start / npm run start, a tab will open automatically and there will be hot reloading.
To run all tests, run yarn test.
To build a bundle ready for deployment, run yarn build.
This project is based on create-react-app, which simplifies setup and some operations.
If you want to have full access to all configuration (this can't be undone), run yarn eject.
On the root route /, you see the list of all canvases from the server with a preview.
If you click the name of the preview image, you see the full canvas.
In the latter view, clicking on one pixel will toggle it between black and white, enabling drawing.