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var net = require('net');
net.createServer(socket=>{
    socket.write("hello!\n");
    socket.pipe(socket); // write every input back to client
}).listen(9000);
=============== OR ===============
var net = require('net');
net.createServer(socket=>{
    socket.write("hello!\n");
    socket.on('data',function(data){ 
        socket.write(data);
    });
}).listen(9000);