Question

I’m trying to convert RSS to JSON but when I use console in Chrome I get this error

XMLHttpRequest cannot load
http://www.blastcasta.com/feed-to-json.aspx?feedurl=http://www.startalkradio.net/?page_id=354.
Origin null is not allowed by Access-Control-Allow-Origin.

jQuery:

$(document).ready(function() {
    var rss_url = "http://www.blastcasta.com/feed-to-json.aspx?feedurl=http://www.startalkradio.net/?page_id=354";

    $.ajax({
        type : 'GET',
        url : rss_url,
        succces : function(data) {
            $.each(data.rss, function(i, item) {
                $("#results").append('<ul>' + item.channel.item.description + '</ul>');

            });
        },
        dataType : 'json',
        async : true
    });

    function fetchRss(data) {
        $.each(data.rss, function(i, item) {
            $("#results").append('<ul>' + item.channel.item.description + '</ul>');

        });
    }

});

Answer 1

UPDATE: this answer suggests using the Google Feed API which has been deprecated. Other options include Superfeedr: Converting RSS to JSON

That error happens because the RSS file is not in your server, so you are violating the Access-Control-Allow-Origin.

Try this plugin that is used for cross-domain purposes with RSS:

http://jquery-howto.blogspot.com/2009/11/cross-domain-rss-to-json-converter.html

EDIT:

Library download link:

http://code.google.com/p/lomodroid/source/browse/src/functions/jquery.jgfeed.js

Live demo with twitter:

http://jsfiddle.net/oscarj24/NbDWb/

Live demo with the link used in the question:

http://jsfiddle.net/oscarj24/NbDWb/3/

This will convert RSS to JSON

<script src="jquery.js"></script>
<script src="jquery.jgfeed.js"></script>
<script>
$.jGFeed('http://twitter.com/statuses/user_timeline/26767000.rss',
  function(feeds){
    // Check for errors
    if(!feeds){
      // there was an error
      return false;
    }
    // do whatever you want with feeds here
    for(var i=0; i<feeds.entries.length; i++){
      var entry = feeds.entries[i];
      // Entry title
      entry.title;
    }
  }, 10);
</script>