JSFiddle - React, Tailwind, and code Playground

JavaScript

exports.user = function (req, res) {
  var user        = req.body.steamid;
  var http        = require('http');
  var parseString = require('xml2js').parseString;
  var output      = '';

     var options = {
         host: 'steamcommunity.com',
         path: '/id/' + user + '/games?xml=1'
     };

     var pouet = function (callback) {
         request = http.get(options, function (res) {
             res.setEncoding('utf8');
             console.log('STATUS: ' + res.statusCode);

             res.on("data", function (chunk) {
                 output += chunk.toString('utf8');
                 callback(output);
             });

         }).on('error', function (e) {
             console.log('ERROR: ' + e.message);
         });
     };

     pouet(function (dataFromAjax) {
         parseString(dataFromAjax, function (err, result) {
             var totalSize  = 0;
             var steamID    = result.gamesList.steamID;
             var steamID64  = result.gamesList.steamID64;
             var json       = result.gamesList.games;
             var query      = Game.find(null);

             //Run in each game and lets find if we found them in the bdd
             for (var i = json[0].game.length - 1; i >= 0; i--) {
                var totalSize  = 0; // I could put that way earlier in code but it changes nothing
                 query.where('steamID', json[0].game[i].appID[0]);
                 query.exec(function (err, resultat) {
                     if (err) {}
                     for (var i = 0, l = resultat.length; i < l; i++) {
                         var game = resultat[i];
                         totalSize += game.size;   //totalSize is set up to the right size                      
                     }
                 });
                 //totalSize fall to 0 and forget his past number
             }

             res.render('user', {
                 steamid: steamID,
                 steamid64: steamID64,
                 size: totalSize,
      ...