Programmatically render GeoJSON to image file

I have a series of GeoJSON objects that I wish to render on a map programatically.

I can use http://geojson.io and upload my GeoJSON but how do I programatically do this and export a PNG or other image file?

https://github.com/mapbox/geojson.io looked great, but it posts publicly to the geojson.io site.

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