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net

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You can use node:net ↗ to create a direct connection to servers via a TCP sockets with net.Socket ↗.

These functions use connect functionality from the built-in cloudflare:sockets module.

index.jsjs
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.tsts
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 ↗ and net.SocketAddress ↗ are available.

Note that the net.Server ↗ class is not supported by Workers.

The full node:net API is documented in the Node.js documentation for node:net ↗.