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John Resig has written another great coding example. The code takes an RSS Feed and converts it into JSON. You will also notice that in the code he uses DOM manipulation instead of eval (you can read my post on using JSON without eval by clicking here) to bring the code into the JavaScript.

Below is an excerpt from the post.

Interface

This script currently has a REST interface, accessible via a GET request. The full request would look something like this:
GET http://ejohn.org/apps/rss2json/?url=URL&callback=CALLBACK
the URL parameter would contain the URL of the RSS/Atom feed which you are attempting to convert. The optional Callback parameter would reference a callback function that you wish to have called, with the new data.

You can test this out by visiting the following URL:
http://ejohn.org/apps/rss2json/?url=http://ejohn.org/index.rdf
Sample Code and Demo

A simple, sample, program would look something like this:
getRSS("http://digg.com/rss/index.xml", handleRSS);

function handleRSS(rss) {
alert( "Dowloaded: " + rss.title );
}

function getRSS(url, callback) {
feedLoaded = callback;
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = "http://ejohn.org/apps/rss2json/?url=" + url
+ "&callback=feedLoaded&t=" + (new Date()).getTime();
document.getElementsByTagName("head")[0].appendChild(script);
}

Click here to read the full post. The post also contains the back end code as well as the above.

This idea could be used for any XML web service that you would like to have in JSON. So, if you have an application that uses JSON and the data you need is in XML try extending this code to meet your needs.