Using node to install something using command line

install-cl-js.js

//Using npm command packgae 
var npm = require('npm');
npm.load(function(err) {
  npm.commands.install(['ffi'], function(er, data) {
    // log errors or data
  });
  npm.on('log', function(message) {
    console.log(message);
  });
});


//Using exec
var exec = require('child_process').exec,child;

 child = exec('npm install ffi',
 function (error, stdout, stderr) {
     console.log('stdout: ' + stdout);
     console.log('stderr: ' + stderr);
     if (error !== null) {
          console.log('exec error: ' + error);
     }
 });
 
 //http://stackoverflow.com/questions/15957529/can-i-install-a-npm-package-from-javascript-running-in-node-js
 
 //https://strongloop.com/strongblog/node-js-v0-12-shell-programming-synchronous-child-process/