index.js

var ig = require('instagram-node').instagram();
var config = require('./config.js');
var Client = require('instagram-private-api').V1;
var device = new Client.Device('someuser');
var storage = new Client.CookieFileStorage(__dirname + '/cookies/someuser.json');
console.log(config);

if(false){
  // And go for login
  Client.Session.create(device, storage, config.user_name, config.password)
    .then(function(session) {
        // Now you have a session, we can follow / unfollow, anything...
      // And we want to follow Instagram official profile
      return [session, Client.Account.searchForUser(session, 'instagram')]   
    })
    .spread(function(session, account) {
      return Client.Relationship.create(session, account.id);
    })
    .then(function(relationship) {
      console.log(relationship.params)
      // {followedBy: ... , following: ... }
      // Yey, you just followed @instagram
    });
}