var req = new XMLHttpRequest();
    req.open('GET', '/path/to/my/thing', true); // true means it's asynchronous, you want that
    req.responseType = 'json';
    req.send(null); // because you don't have data to send, you're just requesting
    function shit_broke() {

    }
    req.onload = function() {
        if (req.status==200) {
            console.log(req.response);
            _this.importBot(req.response);
            // do something when it's chill
        } else {
            shit_broke();
            // do something when it's not chill, and its probably your server
            // because the status code is not 200
        }
    };
    req.onerror = function() {
        shit_broke();
    };