web-check/api/get-ip.js

import dns from 'dns';
import middleware from './_common/middleware.js';
import { parseTarget } from './_common/parse-target.js';

// Resolve the IP address for the target hostname.
const lookupAsync = (address) => new Promise((resolve, reject) => {
  dns.lookup(address, (err, ip, family) => {
    if (err) reject(err); else resolve({ ip, family });
  });
});

const ipHandler = async (url) => {
  const { hostname } = parseTarget(url);
  return await lookupAsync(hostname);
};

export const handler = middleware(ipHandler);
export default handler;