Socket.io emit doesnt work - node.js

Question

Basically,
I first initiate socket.io like this:
var io = require('socket.io')(1337);
Then, after using http to get a POST request and check some info, I try this:
var updateArray = {timer:"start"};
jsonUpdate = JSON.stringify(updateArray);
io.emit('update', jsonUpdate);
But it doesn't send the sockets, and I really can't understand the socket.io documentation sadly, so I'd be happy if someone can help me out.
Server code:
var http = require('http');
var fs = require('fs');
var io = require('socket.io')(1337);
var initialBomb = 0;
function now() {
return Math.floor(new Date() / 1000);
}
http.createServer(function (req, res) {
var body = "";
req.on('data', function (chunk) {
if (req.method == 'POST') {
body += chunk;
}
});
req.on('end', function () {
parsedBody = JSON.parse(body);
if (parsedBody.round["bomb"] == "planted") {
var rightNow = now();
var initialCheck = initialBomb + 41;
if (rightNow > initialCheck) {
initialBomb = now();
var updateArray = {timer:"start"};
jsonUpdate = JSON.stringify(updateArray);
io.emit('update', jsonUpdate);
console.log(jsonUpdate);
}
}
});
}).listen(3000);
Client Code:
<script>
var socket = io('87.98.219.48:1337');
socket.on('update', function(payload) {
var data = JSON.parse(payload);
console.log(payload);
if (data['timer'] == 'start') {
initTick = timerNow();
setTimeout(tick, delay);
}
});
</script>