Google Maps API key needed

This app loads the Maps JavaScript API, which requires your own API key.

1. Open the Google Maps Platform console and create/select a project.
2. Enable the Maps JavaScript API.
3. Create an API key (Credentials → Create credentials → API key). For local use, restrict it to HTTP referrers like http://localhost:*.

The key is kept in this browser's localStorage only and is sent nowhere except Google's Maps API. You can also pass it once as ?key=… in the URL.