gistfile1.js

function createInsta(email, userid, cb) {
  
  ensureExists(function (error) {
    if (error) return cb(error);
    
    getData(function (error, data) {
      if (error) return cb(error);
      return cb(null, data);
    });
  });
  
  function ensureExists(cb) {
    fs.exists('users/' + email + '/' + userid, function (exists) {
      if (!exists) {
        fs.mkdir('users/' + email + '/' + userid, function (error) {
          if (error) return cb(error);
          
          fs.readFile("data/data.json", "utf-8",function (error, contents) {
            if (error) return cb(error);
            
            fs.writeFile('users/' + email + '/' + userid +  '/instagram.json', contents, function (error) {
              if (error) return cb(error);
              
              console.log("insta folder created");
              
              return cb();
            });
          });
        });
      } else {
        return cb();
      }
    }
    
    function getData (cb) {
      console.log("Initializing Data")
      fs.readFile('users/' + email + '/' + userid +  '/instagram.json', "utf-8", function (error, data) {
        if (error) return cb(error);
        
        data = JSON.parse(data);
        request(("https://instagram.com/" + userid + "/?__a=1"), function(error, response, body) {
          if (error) return cb(error);
          
          var res = JSON.parse(body);
          result = res.user.followed_by.count
          
            data.STARTING_COUNTS[0].DAY = result;
            data.STARTING_COUNTS[0].WEEK = result;
            data.STARTING_COUNTS[0].MONTH = result;
            
            return cb(null, data);
        });
      });
    }
  }
}
            
Call it like this: 
            createInsta("xxx@email.com", 3, function (error, data) {
              if (error) {
                console.log(error);
              } else {
                console.log("data is ");
                console.log(data);
              }
            })