TypeError: Object #<Server> has no method 'connect'

I have an existing socket.io app to update a page, someone writes a message and it appears on all the clients connected to the socket. This part works fine.

I need to read a json feed every minute and send the data in feed into same system, basically I am trying to add a secondary sender into system. (I will put 'feed reading' part into infinite loop later) Here is the code:

var http = require('http');
var server = require('http').Server();
var io = require('socket.io')(server);
var socket = io.connect('http://host_url.com:8000');

http.get('http://json_feed_url', function(res) {
    var body = '';

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

    res.on('end', function() {
        var items = JSON.parse(body)
        items.forEach(function(item, index) {
          socket.emit('update', {
                title: item.title,
                message: item.message
            });
        });
    });
}).on('error', function(e) {
      console.log("Got error: ", e);
});

When I run the script I got:

var socket = io.connect('http://host_url.com:8000'); ^ TypeError: Object # has no method 'connect' at Object. (inde x.js:4:17) at Module._compile (module.js:456:26) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Function.Module.runMain (module.js:497:10) at startup (node.js:119:16) at node.js:902:3

I derived the code from the 'message form' page and it works perfectly:

<script src="http://host_url.com:8000/socket.io/socket.io.js"></script>
<script>
    var socket = io.connect('http://host_url.com:8000');

    function update_score() {
        socket.emit('update', {
            title: $("#txtTitle").val(),
            message: $("#txtMessage").val()
        });
    }
</script>

The message form, the host app and this feed reader are in the same folder, so it uses the same socket.io library.

Any suggestion?