There are four ways to create your TopoJSON:
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Upload
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POST
POST http://topojsonify.herokuapp.com/
POST directly in the body, or as a variable in the POST body
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Map
Edit your data on http://topojsonify.herokuapp.com/map
Drop GeoJSON, TopoJSON, or shapefiles onto the map, draw and edit geometry, get back TopoJSON
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Back Up
Anything wrong here? Put your GeoJSON into shancarter.github.io/distillery/ or MapShaper
TopoJSONify on GitHub
TopoJSON on GitHub