Refer to nodejs configuration prefix and global module install path
$ npm install node-prefix
var config = require('node-prefix')
var nodePrefix = config.prefix()
// '/usr/local/lib'
var globalModulePath = config.global('moduleName')
// '/usr/local/lib/node_modules/moduleName'
The MIT License (MIT)
Copyright (c) 2014 Masaaki Morishita