JS: LoadJson

loadJson.js

function loadJSON(callback) {   

    var xobj = new XMLHttpRequest();
    xobj.overrideMimeType("application/json");
    xobj.open('GET', 'file.json', true);
    xobj.onreadystatechange = function () {
        if (xobj.readyState == 4 && xobj.status == "200") {
            
            // .open will NOT return a value but simply returns undefined in async mode so use a callback
            callback(xobj.responseText);
     
        }
    }
    xobj.send(null);
    
}

// Call to function with anonymous callback
loadJSON(function(response) {
  // Do Something with the response e.g.
  //jsonresponse = JSON.parse(response);

        // Assuming json data is wrapped in square brackets as Drew suggests
        //console.log(jsonresponse[0].name);
    
});