How to get the client’s IP address in socket.io and JavaScript?

To get the client’s IP address in socket.io and JavaScript, we use the handshake.address property.

For instance, we write

const io = require("socket.io").listen(server);

io.sockets.on("connection", (socket) => {
  const address = socket.handshake.address;
  console.log(address.address, address.port);
});

to listen for the connection event with on.

We get the client address from socket.handshake.address.

And we get the IP address and port from the returned address.