Code that updates FreeDNS.

README.md

Usage

First of all, add to your .env file tis code:

FREEDNS_URL=PUT YOUR URL HERE!!!

Then you can run it:

//check IP changes every 1 sec:
let service = FreeDNS.startService(); //start service
clearInterval(service); //close service

//update just one time:
FreeDNS.updateDns();

You can also use it alongside express.

FreeDNS.js

import { exec } from "child_process";
import { promisify } from "util";

export default class FreeDNS {

  /**
   * Update FreeDNS.
   */
  static async updateDns() {
    let exe =  promisify(exec);
    let dns = await exe(`curl ${process.env["FREEDNS_URL"]}`); //alternatively put your update url here.

    console.log("[FreeDNS] ", dns.stdout ? dns.stdout : dns.stderr);
  }

  /**
   * Start a service that updates FreeDNS every time the public IP changes.
   * 
   * @param {number} timeout default to 1000
   * @returns {setInterval} a setInterval event
   */
  static startService(timeout=1000) {
    if (!__RAM) {
      globalThis.__RAM = {};
    }

    return setInterval(async () => {
      let exe = promisify(exec);
      let ipv6 = "";
      try {
        ipv6 = await exe(`curl https://api6.my-ip.io/ip.txt`); //replace 6 for 4 if you want IPv4
        ipv6 = ipv6.stdout;
      } catch (e) {
        console.error("[FreeDNS]",e,"(Try to check your connection).");
      }

      if (ipv6 && __RAM.IPv6 !== ipv6) {
        FreeDNS.updateDns();
        __RAM.IPv6 = ipv6;
      }
    },timeout);
  }
}