Conversion from Belgian Lambert 72 projection to WGS84 latitude/longitude.
$ npm install --save bl72tolatlng
var bl72ToLatLng = require( "bl72tolatlng" );
bl72ToLatLng( 235166, 148974 ); // returns { "latitude": 50.645173, "longitude": 5.572941 }
Algorithms are taken from this site.
MIT © leny