UDP Listener: Ping

An example of a UDP listener on localhost that will log the message if written to and close the connection if connected to.

Instantiate an instance of text decoder to read the UDP stream bytes back into plaintext.

const decoder = new TextDecoder();

Instantiate an instance of a UDP listener on localhost port 10000.

const listener = Deno.listenDatagram({
  port: 10000,
  transport: "udp",
});

Await asynchronous messages that are sent to our UDP listener.

for await (const [data, address] of listener) {

Here we log the address of the sender of the data

  console.log("Server - received information from", address);

Here we log the results of the bytes that were read into our buffer array.

  console.log("Server - received:", decoder.decode(data));

We close the connection that was established.

  listener.close();
}

Run this example locally using the Deno CLI:

deno run --allow-net --unstable https://examples.deno.land/udp-listener.ts

Additional resources: