crs-defs.json for https://github.com/perliedman/reproject

crs-defs.json

{
        "EPSG:3857": "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over",       "EPSG:3006": "+proj=utm +zone=33 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs",
        "EPSG:4326": "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs"
}