Fast, unopinionated, minimalist web framework for node.
As far as actually implementing this, If I had to do it, I would probably use Leaflet for your front-end web mapping, Node.js for your back-end (using express to handle routing, and there is a library called geojson that lets you generate GeoJSON, but I've never personally used it). You could also accomplish this with relative ease using either PHP, Python or R.
Is Express being maintained?
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