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    <p>Are you doing this on the client side (in the browser) or on the server side? You mention using <code>alert</code>, but I'm not aware of a <code>clients()</code> method on the client side that does what you want.</p> <p>On the server side, <code>clients()</code> returns an array of <code>Socket</code>s <a href="https://github.com/LearnBoost/socket.io/blob/6074795b191248fa36db37b89df3c95e1520adcb/lib/namespace.js#L44-61" rel="nofollow">as defined by this method</a>:</p> <pre><code>/** * Retrieves all clients as Socket instances as an array. * * @api public */ SocketNamespace.prototype.clients = function (room) { var room = this.name + (room !== undefined ? '/' + room : ''); if (!this.manager.rooms[room]) { return []; } return this.manager.rooms[room].map(function (id) { return this.socket(id); }, this); }; </code></pre> <p>The Node.js console and browsers with dev tools provide a <code>console</code> object that allows debugging; generally, you can call <code>console.log(something)</code> where <code>something</code> pretty much anything; in the case of an object, the details of the object will be enumerated in one way or another.</p> <p>[Edit]</p> <p>Since you're already using <code>socket.set</code> to store the username, perhaps you can try something like this:</p> <pre><code>// server socket.on('connection', function(socket) { ... socket.on('disconnect', function() { socket.get('username', function (err, name) { socket.broadcast.emit('disconnected', name); }); }); ... }); // client socket.on('connect', function () { ... socket.on('disconnected', function(name) { console.log(name + " disconnected."); }); ... }); </code></pre>
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    1. COI have added my current code to show more in depth of what is happening. This is done on the server (app.js) and nothing gets pushed to the console.
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    2. COI assume the first part is on the server and the second is on the client? `io.sockets.clients()` returns an array of `Socket` objects; you cannot send them over the Internet to the client. You'll need to get the username data out of them and send, say, an array of strings or something instead. Are you using `socket.set` to set the username? If not, how are you keeping track of them?
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    3. COI use `socket.set('username', 'MyName')` and `socket.set('id', socket.id)` is there a way to grab the set vars and then possibly `.emit` to the client?
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