Proj4js ported for Node.js without the asynchronous definition loading.
Synchronous Proj4js slimmed down for Node.js
Convert a WGS884 coordinate to SWEREF99 TM.
var proj4node =sweref =p = sweref;console;
$ git clone$ cd proj4node$ ./connect-proj4js-repo.sh
Then read instructions from output.
Important to note, I have only removed functionality from the original Proj4js project. All the hard stuff (algorithms and parsing) is solely thanks to the authors of Proj4js.