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Ans: You can try the below code to send a message to a particular client with socket.io.
io.to(socket.id).emit("event", data);
Whenever the user joins into the server, the socket details will be generated including the ID. The UD is responsible for sending a message to a particular person or people.
The primary step is to store all the socket.ids in an array.
var person={};
person[name] = socket.id;
The name will be the receiver name.
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