WebSocket multipurpose chatserver for node.js

//WebSocket multipurpose chatserver
//how it works: retransmits the message to all members of the current room
//message packet format: stingified JSON with mandatory roomid field
//other fields can be arbitrary data

var WebSocketServer = new require('ws');
var webSocketServer = new WebSocketServer.Server({port: 8081});
var clients = {}, rooms = {};

webSocketServer.on('connection', function(ws) {
    var id = Math.ceil(Math.random()*(1<<30));
    clients[id] = ws;
    ws.on('message', function(rawmsg) {
        try{
            var packet = JSON.parse(rawmsg);
            if('roomid' in packet) {
                var roomid = packet.roomid;
                if(!(roomid in rooms))rooms[roomid]=[];
                if(rooms[roomid].indexOf(clients[id])==-1) rooms[roomid].push(clients[id]);
                for(var c in rooms[roomid]){
                    var cli = rooms[roomid][c];
                    if(cli!=clients[id]) cli.send(rawmsg)
                }
            }
        }
        catch(err){}
    });
    ws.on('close', function(){
        for(var r in rooms) {
            var cliind = rooms[r].indexOf(clients[id]);
            if(cliind>-1) rooms[r].splice(cliind,1);
        }
        delete clients[id]
    })
});