---
title: Support for Node.js DNS, Net, and Timer APIs in Workers | Cloudflare Docs
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## Support for Node.js DNS, Net, and Timer APIs in Workers

Jan 28, 2025, 01:00 PM

[Workers](https://developers.cloudflare.com/workers/)

When using a Worker with the [`nodejs_compat`](https://developers.cloudflare.com/workers/runtime-apis/nodejs/) compatibility flag enabled, you can now use the following Node.js APIs:

* [`node:net`](https://developers.cloudflare.com/workers/runtime-apis/nodejs/net/)
* [`node:dns`](https://developers.cloudflare.com/workers/runtime-apis/nodejs/dns/)
* [`node:timers`](https://developers.cloudflare.com/workers/runtime-apis/nodejs/timers/)

#### node:net

You can use [`node:net`](https://nodejs.org/api/net.html) to create a direct connection to servers via a TCP sockets with [`net.Socket`](https://nodejs.org/api/net.html#class-netsocket).

* JavaScript

  ```js
  import net from "node:net";


  const exampleIP = "127.0.0.1";


  export default {
    async fetch(req) {
      const socket = new net.Socket();
      socket.connect(4000, exampleIP, function () {
        console.log("Connected");
      });


      socket.write("Hello, Server!");
      socket.end();


      return new Response("Wrote to server", { status: 200 });
    },
  };
  ```

* TypeScript

  ```ts
  import net from "node:net";


  const exampleIP = "127.0.0.1";


  export default {
    async fetch(req): Promise<Response> {
      const socket = new net.Socket();
      socket.connect(4000, exampleIP, function () {
        console.log("Connected");
      });


      socket.write("Hello, Server!");
      socket.end();


      return new Response("Wrote to server", { status: 200 });
    },
  } satisfies ExportedHandler;
  ```

Additionally, you can now use other APIs including [`net.BlockList`](https://nodejs.org/api/net.html#class-netblocklist) and [`net.SocketAddress`](https://nodejs.org/api/net.html#class-netsocketaddress).

Note that [`net.Server`](https://nodejs.org/api/net.html#class-netserver) is not supported.

#### node:dns

You can use [`node:dns`](https://nodejs.org/api/dns.html) for name resolution via [DNS over HTTPS](https://developers.cloudflare.com/1.1.1.1/encryption/dns-over-https/) using [Cloudflare DNS](https://www.cloudflare.com/application-services/products/dns/) at 1.1.1.1.

* JavaScript

  ```js
  import dns from "node:dns";


  let responese = await dns.promises.resolve4("cloudflare.com", "NS");
  ```

* TypeScript

  ```ts
  import dns from 'node:dns';


  let responese = await dns.promises.resolve4('cloudflare.com', 'NS');
  ```

All `node:dns` functions are available, except `lookup`, `lookupService`, and `resolve` which throw "Not implemented" errors when called.

#### node:timers

You can use [`node:timers`](https://nodejs.org/api/timers.html) to schedule functions to be called at some future period of time.

This includes [`setTimeout`](https://nodejs.org/api/timers.html#settimeoutcallback-delay-args) for calling a function after a delay, [`setInterval`](https://nodejs.org/api/timers.html#setintervalcallback-delay-args) for calling a function repeatedly, and [`setImmediate`](https://nodejs.org/api/timers.html#setimmediatecallback-args) for calling a function in the next iteration of the event loop.

* JavaScript

  ```js
  import timers from "node:timers";


  console.log("first");
  timers.setTimeout(() => {
    console.log("last");
  }, 10);


  timers.setTimeout(() => {
    console.log("next");
  });
  ```

* TypeScript

  ```ts
  import timers from "node:timers";


  console.log("first");
  timers.setTimeout(() => {
    console.log("last");
  }, 10);


  timers.setTimeout(() => {
    console.log("next");
  });
  ```
