getEC2.js

// Load the SDK and UUID
var AWS = require('aws-sdk');
AWS.config.update({region: 'ap-northeast-1'})

// Create an S3 client
//var s3 = new AWS.S3();
var ec2 = new AWS.EC2();
ec2.describeInstances({}, function(err, data) {
  if (err) console.log(err, err.stack);
  else {
    console.log(data);
    data.Reservations.forEach(function(reservation) {
      console.log(reservation);
    });
  }
});