Scan your local network for active services

scan.js

const http = require('http');
const net = require('net');

const PORTS_TO_SCAN = [80, 443, 22, 21, 8080];

const scanService = (i, port) => new Promise((resolve) => {
  const ip = `192.168.1.${i}`;
  const socket = new net.Socket();
  socket.setTimeout(4000);
  socket.on('connect', () => {
    socket.destroy();
    resolve({ ip, port });
  }).on('timeout', () => {
    socket.destroy();
    resolve(false);
  }).on('error', () => {
    socket.destroy();
    resolve(false);
  });
  socket.connect(port, ip);
});


http
  .createServer(async (req, res) => {
    const scanTasks = [];

    for (let i = 1; i <= 254; i++) {
      scanTasks.push(...PORTS_TO_SCAN.map((port) => scanService(i, port)));
    }

    const services = await Promise.all(scanTasks);
    res.writeHead(200, { 'Content-Type': 'text/html' });
    res.end(services.filter(Boolean).map(s => `<br/><a href="//${s.ip}:${s.port}" target="_blank">${s.ip}:${s.port}</a>`).join(''));
  })
  .listen(3000, () => console.log(`http://localhost:3000`));