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Sorry, no node.js here ;) The beauty of iD is that it's all client-side Javascript. No dynamic server components involved.

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How do the maps get saved then? Or is that part of it still in the works?

It's fully functional, and you can switch over to the live OpenStreetMap database by clicking 'dev' in the lower right. Loading and saving data happens via an XHR request to the OpenStreetMap API hosted on http://www.openstreetmap.org. The API supports CORS, making direct cross-origin connections possible.

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