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How to get socket.io number of clients in a room?

my socket.io version is 1.3.5

I want to get the number of clients in a certain room.

This is my code.

 socket.on('create or join', function (numClients, room) {
            socket.join(room);
    });

I am using this code to get clients in a room:

console.log('Number of clients',io.sockets.clients(room));
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4 answers


To get the number of clients in a room, you can do the following:

    function NumClientsInRoom(namespace, room) {
      var clients = io.nsps[namespace].adapter.rooms[room];
      return Object.keys(clients).length;
    }


These variable clients will contain an object where each client is a key. Then you just get the number of clients (keys) in that object.

If you haven't defined a namespace, the default is "/".

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Have a counter variable to keep the count, increase when someone joins and decreases when people disconnect.



io.on('connection', function (socket) {

var numClients = {};

socket.on('join', function (room) {
    socket.join(room);
    socket.room = room;
    if (numClients[room] == undefined) {
        numClients[room] = 1;
    } else {
        numClients[room]++;
    }
});

socket.on('disconnect', function () {
     numClients[socket.room]--;
});
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In socket.io ^ 1.4.6

function numClientsInRoom(namespace, room) {
    var clients = io.nsps[namespace].adapter.rooms[room].sockets;
    return Object.keys(clients).length;
}

You need to add .sockets

in rooms[room]

as clients variables contain all connections inside a variable sockets

.

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This job is for me.

// check if your room isn't undefined.
if (io.sockets.adapter.rooms['your room name']) 
{
   // result
   console.log(io.sockets.adapter.rooms['your room name'].length);
}
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