Node JS Battle.net API example guild members data

/*
* Node JS battle.net API tool - load guild members data
*
* This example will setup a simple express HTTP server for serving /public/ directory
* and load guild members data from battle.net and save a copy to your server for later use.
*
* When a new request starts from /api/json/guild-members (You can make JS ajax call to this link and use JSON.parse the response)
* this will first search a copy of the guild members data from your local server,
* if local copy is not present it will download a new copy from the battle.net.
* In this way you won't run out of free requests to your battle net api.
*
* Your copy of the data will be used about 1 day, then it will load a new copy.
*/
var fs = require('fs');
var path = require('path');
var request = require("request");
var express = require('express');
var app = express();
var server = require('http').createServer(app);
var port = process.env.PORT || 80;

server.listen(port, function () {
    console.log('Server listening at port %d', port);
});

// Server static assets
app.use(express.static(path.join(__dirname, '/public')));
//app.use('/static', express.static(path.join(__dirname, '/public')));

// Route for home
app.get('/', function (req, res) {
    res.sendFile(path.join(__dirname, '/public/index.html'));
});

/*
* Battle.net API tools
* - public/guild-members.json ( /api/json/guild-members )
* - loaded once per day, then use local copy
*/
// Function: Load new JSON from battle.net
function getMembers(res, wFile) {
    request({
        url: 'https://eu.api.battle.net/wow/guild/YOUR_SERVER_NAME/YOUR_GUILD_NAME?fields=members&locale=en_GB&apikey=YOUR_API_KEY',
        json: true
    }, function (error, response, body) {
        if (!error && response.statusCode === 200) {
            fs.writeFile(wFile, JSON.stringify(body), 'utf8', function (errorWrite, data) {
                if (errorWrite) {
                    console.log("Write error:", errorWrite);
                } else {
                    res.setHeader('Content-Type', 'application/json');
                    res.send(body);
                }
            });
        } else {
            console.log("Request error:", error);
        }
    });
}

// Express route for the battle.net api: guild-members
app.get('/api/json/guild-members', function (req, res) {

    var guildFile = path.join(__dirname, '/public/data-guild-members.json');

    // Load JSON file from local
    fs.readFile(guildFile, 'utf8', function (errorRead, fileData) {
        if (errorRead) {
            // File does not exists or can't be read, try creating new file
            console.log('Downloading new copy!');
            getMembers(res, guildFile);
        } else {
            fs.stat(guildFile, function (errorStat, statData) {
                if (errorStat) {
                    console.log("Stat error:", errorStat);
                } else {
                    var timeModifyed = new Date(statData.mtime);
                    var timeNow = new Date();
                    // 1 day delay
                    if (timeNow.getDate() !== timeModifyed.getDate()) {
                        // File is past its expiration date, get new file
                        console.log('Downloading new copy!');
                        getMembers(res, guildFile);
                    } else {
                        console.log('Using local copy!');
                        res.setHeader('Content-Type', 'application/json');
                        res.send(fileData);
                    }
                }
            });
        }
    });
});

// Route for everything else.
app.get('*', function (req, res) {
    //res.send('Route not found.');
    res.sendFile(path.join(__dirname, '/public/404.html'));
});