How do I return this function's value for (global) re-use

Question

var request = require('request-promise');
var cheerio = require("cheerio");
var fs = require('fs');


function sums() {
    function parseSites(urls, callback) {
        var parsedSites = [];
        var promiseList = urls.map(getPage);

    Promise.all(promiseList).then(function (data) {
        callback(data.map(parse));
    });

    return parsedSites;
}

//get data at url
function getPage(url) {

    return request.get(url);
}

//cheerio element grabber
function parse(body) {
    var $ = cheerio.load(body);
    return $(".stats > h3:nth-child(1) > span:nth-child(1)").html();
}

//array urls
parseSites([
    'url1' (120),
    'url2' (6.7k),
    'url3' (12k)
],

    function transy(data) {

        //Turn all array elements into integers
        //OLD ARRAY, NEW ARRAY
        var q = data;
        var z = [];

        for (i = 0; i < data.length; i++) {

            var x = q[i];
            var y = x.includes('.');

            if (y) {
                y = x.replace(/k/, "00");
                y = y.replace('.', "");
            }
            else {
                y = x.replace(/k/, "000");
            }
            z.push(y);
        }    
        console.log(z);
    });
}

sums();

Running the script in node makes 'console.log(z)' return:

['120', '6700', '12000']

I want to use this result and be able to parse it to my client as json/object/variable.

I tried the parse/stringify on the client and in the scope off my 'server.js' respectively to no avail. This is after using module.exports to 'require' it within the 'server.js' file.

I tried to change 'console.log(z)' to 'return z' and also within multiple places in the chain to no avail.

*quick note: the values behind the url within parenthesis (parseSites) are the values I get after scraping with cheerio and not the actual code. I use 'transy()' to make them in whole values for calculation purposes.

I googled it in many places and read (and still reading) node docs and tutorials, but it just seems I can't place my finger on what I do wrong.

I think it's because of the async runtime, but at this point I'm just guessing.

I used the below code in the end which does work in parsing it as a file and use it within a different way, but this is "cheating" in my context and not what I actually want it to do, which is keeping it in the program without active fs i/o.

var arr = z;
                var str = JSON.stringify(arr, null, 4);
                var filename = './public/output.js';
                var out = "var out = " + str + ";";

                fs.writeFile(filename, str, function (err) {
                    if (err) {
                        console.log(err);
                    } else {
                        console.log('File written!');
                    }
                });