Just a quick library-free script to grab a feed and parse it

getfeed-nolibs.js

var https = require('https');
var http = require('http');
var url = require('url');

var feedUrl = 'http://www.techmeme.com/feed.xml';

main();

function main(){

    getFeed(feedUrl, function(feedStr){

        // console.log(feedStr);

        parseFeed(feedStr, function(items){

            for(var i=0; i < items.length; i++){

                console.log(items[i].title, items[i].guid);
            }

        });

    });

}


function getFeed(feedUrl, fn) {

    var parts = url.parse(feedUrl);

    var options = {
        host: parts.host,
        path: parts.path,
        method: 'GET'
    };

    var callback = function(res) {
        var str = '';
        var success = true;

        if (res.statusCode >= 300 && res.statusCode < 400) {
            getFeed(res.headers.location, fn);
            success = false;
        }

        res.on('data', function(body) {
            str += body;
        });

        res.on('end', function() {
            if(success){
                fn(str);
            }
        });

    };

    var req;

    if(parts.protocol == 'https'){
        req = https.request(options, callback);
    } else {
        req = http.request(options, callback);
    }

    req.on('error', function(e) {
      console.error(e);
    });

    req.end();
}


function parseFeed(str, fn){
    //This will break, hard. Don't do this.

    var regex = /<item>([\s\S]*?)<\/item>/g;
    var matches = [];

    var result;

    while ((result = regex.exec(str)) !== null) {
        var itemStr = result[1];
        var item = {};
        item.title = /<title>(.*?)<\/title>/.exec(itemStr)[1];
        item.guid = /<guid>(.+?)<\/guid>/.exec(itemStr)[1];
        item.pubDate = /<pubDate>(.+?)<\/pubDate>/.exec(itemStr)[1];

        //atom
        // item.description = /<description><!\[CDATA\[(.*?)\]\]><\/description>/.exec(itemStr)[1];
        // item.link = /<link>(.+?)<\/link>/.exec(itemStr)[1];
        // item.guid = /<guid isPermaLink="false">(.+?)<\/guid>/.exec(itemStr)[1];

        matches.push(item);
    }

    fn(matches);

}