Chat Messages

To the server side, one-on-one chat is basically to forward messages from one socket to another.

Update app.js:

@@ -25,6 +25,11 @@ io.on("connection", (socket) => {
     // Broadcast to all connected clients
     io.emit("contacts", Array.from(users.entries()));
   });
+
+  socket.on("chat", (data) => {
+    const { to } = data;
+    io.to(to).emit("chat", data);
+  });
 });
 
 // Start the server

data has below fields:

to: destination socket ID of the incoming message.
from: socket ID of the sender.
msg: message content.

io.to() is a method provided by Socket.IO that allows you to target specific sockets or rooms when emitting events.

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