A list of different ways to parse json in javascript. Currently unfinished

parsejson.js

// To parse CSV, TSV, etc
// https://code.google.com/p/jquery-csv/ --> Library to parse CSV
// otherwise use ajax call with dataType set to text


// If the JSON file is in string form
// http://stackoverflow.com/questions/4935632/how-to-parse-json-in-javascript
var json = '{"result":true,"count":1}';
var obj = JSON.parse(json);
console.log(obj.count);

// If using JQuery, and file is from an external domain
$.getJSON(url, function (json) {
    alert(json.result);
    $.each(json.list, function (i, fb) {
        alert(fb.result);
    });
});

// If using Ajax
// set dataType to 'json' for json data, 'jsonp' for cross-domain API call
$.ajax({
    type: 'GET',
    url: "myfile.csv",
    dataType: "text",
    success: function (result) {
        console.log(result);
    },
});

// If using XHR and AJAX (and this can get quite verbose...)
// https://mathiasbynens.be/notes/xhr-responsetype-json
var getJSON = function(url, successHandler, errorHandler) {
  var xhr = typeof XMLHttpRequest != 'undefined'
    ? new XMLHttpRequest()
    : new ActiveXObject('Microsoft.XMLHTTP');
  xhr.open('get', url, true);
  xhr.responseType = 'json';
  xhr.onreadystatechange = function() {
    var status;
    var data;
    // http://xhr.spec.whatwg.org/#dom-xmlhttprequest-readystate
    if (xhr.readyState == 4) { // `DONE`
      status = xhr.status;
      if (status == 200) {
        successHandler && successHandler(xhr.response);
      } else {
        errorHandler && errorHandler(status);
      }
    }
  };
  xhr.send();
};

getJSON('https://mathiasbynens.be/demo/ip', function(data) {
  alert('Your public IP address is: ' + data.ip);
}, function(status) {
  alert('Something went wrong.');
});