Socket.io 2.0.4 - Loop through all connected sockets

Question

Hello I'm trying to loop through all connected sockets and check if they have the session data (userid) I'm looking for. Here's my code (doesn't work):

var clients = io.sockets.clients();
console.log(clients);

for(i = 0; i < clients.length; i++) {
    if(clients[i].handshake.session.userid == userid) {
        clients[i].emit(event, data);
    }
}

My question is how I could find an array of sockets since io.sockets.clients() doesn't seem to return an array with the socket objects.

io.sockets.clients().connected doesn't return an array of sockets and therefor I find it hard to loop through all the connected sockets — Johnny Code, Feb 21 '18 at 09:54
Possible duplicate of [Socket.IO - how do I get a list of connected sockets/clients?](https://stackoverflow.com/questions/6563885/socket-io-how-do-i-get-a-list-of-connected-sockets-clients) — Jeremy Thille, Feb 21 '18 at 10:00
Ty, will try that later, but it says socket.io 0.7 you have the clients method — Johnny Code, Feb 21 '18 at 11:34
That is what I have in my code that I posted. (io.sockets.clients()) — Johnny Code, Feb 21 '18 at 11:52
It doesn't give me an error but it doesn't emit anything either when I use the function. Not a duplicate since I got no working answer. — Johnny Code, Feb 21 '18 at 11:53
You're not using v0.7, you said you're using 2.0.4. So it should be `io.sockets.sockets`. And yes it's a duplicate — Jeremy Thille, Feb 21 '18 at 11:58
I found the answer in this article but not the marked answer: https://stackoverflow.com/a/24145381/9332886 — Johnny Code, Feb 21 '18 at 12:06
Yes. I never said the first answer was the one you needed. There are 27 answers to this question — Jeremy Thille, Feb 21 '18 at 12:07

score 2 · Answer 1 · answered Jul 31 '19 at 15:01

2

This should help you.

var sockets = io.sockets.sockets;
for(var socketId in sockets) {
          var s = sockets[socketId]; 
}

answered Jul 31 '19 at 15:01

zdimon77

131
10

score 0 · Answer 2 · edited Jan 18 '21 at 02:01

0

socket.io@2.3.0

io.sockets.sockets is an object where a key is a socketId and value is reference to the socket object.

Object.keys(io.sockets.sockets).forEach((socketId) => {
  const socket = io.sockets.sockets[socketId];
})

edited Jan 18 '21 at 02:01

saro928

3
3

answered Apr 24 '20 at 10:48

Ramit Mittal

483
3
12

1

Doesnt seem to work in ^4 – insivika Jan 19 '22 at 12:07

Socket.io 2.0.4 - Loop through all connected sockets

2 Answers2