xmlhttprequest.js

parseJSON = function (weaponJSON) {
    var parsedJSON = JSON.parse(weaponJSON);
    return parsedJSON['frames']['chaingun_impact.png']['spriteSourceSize']['x'];
};

var setup = function() {
    var xmlRequest = new XMLHttpRequest();
    xmlRequest.open("GET", "/media/resources/gamedev/weapon.json", true);
    
    xmlRequest.onload  = function () { 
        parseJSON = JSON.parse(this.responseText);
    };
    xmlRequest.send();
};