XMLHttpRequest cannot load merriam-webster.com/dictionary/test?_=1456272100963. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://chat.meta.stackexchange.com' is therefore not allowed access.

var checkFilePath = function(filePath){
    fs.access(filePath, fs.F_OK, function(err) {
        return !err;
    });
};

var checkFilePath = function(filePath, successCallback, failureCallback){
    fs.access(filePath, fs.F_OK, function(err) {
        if (err) {
            if (failureCallback) {
                    failureCallback(err);
            }
        } else {
            if (successCallback) {
                    successCallback();
            }
        }
    });
};

checkFilePath("my cool path", function() {
    //success, hooray!
}, function(err) {
    console.log("error checking path: " + err.message);
});

var checkFilePath = function(filePath){
        return new Promise(function(resolve, reject) {
            fs.access(filePath, fs.F_OK, function(err) {
                if(!err){
                    // If FILE / DIR exists check if file or DIR
                    if(fs.lstatSync(filePath).isDirectory() == true){
                        resolve(false);
                    }
                    else{
                        resolve(true);
                    }

                }else{
                    resolve(false);

checkFilePath(filePath).then(function(value){
        console.log(value + " for " + filePath);
        if (value == true){
            serveFile(filePath);
        }
...

app.use("/", function (req, res) { ... file serve stuff}
app.get(APIpath + "data/:taskID/:dataIndex", function (req, res) { ... unreachable code}

var express = require('express');
var path = require('path');
var router = express.Router();
var roles = require('../roles');

router.get('/', function (req, res, next) {
    var permissions = roles.getPermissions(req);
    res.sendfile(path.join(__dirname, permissions.default, 'index.html'));
});

module.exports = router;

 var servePrettyHTML = function(filePath){
        checkFilePath(filePath).then(function(){
            serveFile(filePath);
        },function(err){
            if (err) console.log(err);
            // Check if .html for the path exists
            var plusHTMLPath = filePath +".html";

            checkFilePath(plusHTMLPath).then(function(){
                serveFile(plusHTMLPath);
            },function(err){
                if (err) console.log(err);
                // Check if path ends with a slash

var client = require('./client/route');
app.use('/', client);

(node) warning: possible EventEmitter memory leak detected. 11 logged listeners
added. Use emitter.setMaxListeners() to increase limit.