---
title: net
description: Use the Node.js net module in Cloudflare Workers to create TCP socket connections to external servers.
image: https://developers.cloudflare.com/dev-products-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/workers/llms.txt  
> Use this file to discover all available pages before exploring further. 

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# net

Note

To enable built-in Node.js APIs and polyfills, add the nodejs\_compat compatibility flag to your [Wrangler configuration file](https://developers.cloudflare.com/workers/wrangler/configuration/). This also enables nodejs\_compat\_v2 as long as your compatibility date is 2024-09-23 or later. [Learn more about the Node.js compatibility flag and v2](https://developers.cloudflare.com/workers/configuration/compatibility-flags/#nodejs-compatibility-flag).

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).

These functions use [connect](https://developers.cloudflare.com/workers/runtime-apis/tcp-sockets/#connect) functionality from the built-in `cloudflare:sockets` module.

* [  JavaScript ](#tab-panel-12347)
* [  TypeScript ](#tab-panel-12348)

index.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 });  },};
```

index.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, other APIs such as [net.BlockList ↗](https://nodejs.org/api/net.html#class-netblocklist)and [net.SocketAddress ↗](https://nodejs.org/api/net.html#class-netsocketaddress) are available.

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

The full `node:net` API is documented in the [Node.js documentation for node:net ↗](https://nodejs.org/api/net.html).

```

```

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