Original code: http://www.movable-type.co.uk/scripts/latlong-gridref.html
This is an incredibly simple module which will convert easting/northings to lat and long and back again.
For us in UK only.
Please get in touch if you have any questions. dbamber@gmail.com
npm install UkGeoTool
var geo = require('UkGeoTool');
var output = geo.latLongToEastNorth(53.48417373,-2.237230539);
console.log(JSON.stringify(output));
output = geo.eastNorthToLatLong(384255,398665);
console.log(JSON.stringify(output));
will output
{"easting":384255,"northing":398665}
{"lat":53.48421545664473,"long":-2.23729970585083}