load json with vanilla javascript no jquery

Javascript

/* Function to load json file or url - load json with javascript no jquery */
function load_json(path, callback) {
    var httpRequest = new XMLHttpRequest();
    httpRequest.onreadystatechange = function() {
        if (httpRequest.readyState === 4) {
            if (httpRequest.status === 200) {
                var data = JSON.parse(httpRequest.responseText);
                if (callback) callback(data);
            }
        }
    };
    httpRequest.open('GET', path);
    httpRequest.send(); 
}

// load_json on external file
load_json('https://syndication.twitter.com/timeline/profile?callback=__twttrf.callback&dnt=false&screen_name=kruxor&suppress_response_codes=true&lang=en&rnd=0.4679564944630754', function(data){
    console.log(data);
});