Retrieve A/B e-mails from Mailchimp API sent-to.json

index.js

var request = require('request');
var fs = require('fs');

var apikey = null
var cid = null

var emailFinalArray = [];
var total = 0;
var start = 0;
var limit = 100;
var loopTimes = 0;
var counter = 0;

(function makeCall() {
    request.post(
        'https://us2.api.mailchimp.com/2.0/reports/sent-to.json',
        { 
            json: {
                    "apikey": apikey,
                    "cid": cid,
                    "opts": {
                        "status": "example status",
                        "start": start,
                        "limit": limit
                    }
                }    
        },
        function (error, response, body) {
            if (!error && response.statusCode == 200) {
                loopTimes++;
                console.log(loopTimes);

                total = body.total;

                emailArray = body.data.filter(function(entry) {
                    if (entry.absplit_group == 'a' || entry.absplit_group == 'b') {
                        return true
                    }

                    return false
                }).map(function(entry) {
                    counter++
                    return entry.member.email;
                });

                emailFinalArray = emailFinalArray.concat(emailArray);
                
                if (start <= total / limit) {
                    makeCall();
                    start++

                    return
                }


                emailFinalString = emailFinalArray.join(",\n");

                fs.writeFile("/tmp/test.txt", emailFinalString, function(err) {
                    if (err) {
                        return console.log(err);
                    }

                    console.log("The file was saved - " + counter);
                }); 

            }
        }
    );
})();