Event-driven TCP with net.createServer

import { createServer } from "node:net";

const server = createServer((conn) => {
  console.log(`  [conn] ${conn.remoteAddress}:${conn.remotePort} connected`);

  conn.on("data", (chunk) => {
    conn.write(chunk);
  });

  conn.on("end", () => console.log(`  [conn] disconnected`));
  conn.on("error", (err) => console.log(`  [err] ${err.message}`));
});

server.listen(6380, "127.0.0.1", () => {
  console.log(`echo server listening on 127.0.0.1:6380`);
});