Get root path of node.js application

root.js

var path = require('path');

module.exports = (function () {
  return path.dirname(require.main.filename || process.mainModule.filename);
})();

// Example of usage:
var root = require('root'); // In root will be absolute path to your application

Use process.cwd()

There are all kinds of problems with this, see: https://stackoverflow.com/questions/10265798/determine-project-root-from-a-running-node-js-application