d3's force directed graphs serialized to geojson
npm install -g force-geojson force-geojson foo.json > foo.geojson
The input needs to be formatted like d3 wants it to be: read the docs.
Takes a few options:
times: how many iterations to work on the graph position
padx: how close points can get to -180 and 180 longitude
pady: how close points can get to -90 and 90 latitude