socket emit to

io.to(socketid).emit('message', 'whatever');

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Sunday 80 points

                                    const socket = io('ws://localhost:3000');
socket.on('connect', () =&gt; {  
  // either with send()  
  socket.send('Hello!');
  // or with emit() and custom event names  
  socket.emit('salutations', 'Hello!', { 'mr': 'john' }, Uint8Array.from([1, 2, 3, 4]));});
// handle the event sent with socket.send()
socket.on('message', data =&gt; {
  console.log(data);
});
// handle the event sent with socket.emit()
socket.on('greetings', (elem1, elem2, elem3) =&gt; {
  console.log(elem1, elem2, elem3);
});

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3.89 (9 Votes)

Lightbulb 105 points

                                    io.on('connection', socket =&gt; {  socket.on('disconnecting', () =&gt; {    const rooms = Object.keys(socket.rooms);    // the rooms array contains at least the socket ID  });  socket.on('disconnect', () =&gt; {    // socket.rooms === {}  });});

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