The TopoJSON spec requires us to make TopoJSON with Node.js and NPM
Cool, right? Unless you don't have Node and NPM installed, or you're running a script in another programming language.
Now you can get your GeoJSON converted to TopoJSON, programatically, over the web.
Get your GeoJSON FeatureCollection and do one of the following:
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Go to http://topojsonify.herokuapp.com/ and upload your GeoJSON file
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POST http://topojsonify.herokuapp.com/ with your GeoJSON file in the body
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POST http://topojsonify.herokuapp.com/ with your GeoJSON in the body
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POST http://topojsonify.herokuapp.com/ with your GeoJSON as a variable in the body
BSD License compatible with TopoJSON's license