Skip to main content
function Deno.serve

Serves HTTP requests with the given handler.

You can specify an object with a port and hostname option, which is the address to listen on. The default is port 9000 on hostname "".

The below example serves with the port 9000.

Deno.serve((_req) => new Response("Hello, world"));

You can change the address to listen on using the hostname and port options. The below example serves on port 3000.

Deno.serve({ port: 3000 }, (_req) => new Response("Hello, world"));

You can stop the server with an AbortSignal. The abort signal needs to be passed as the signal option in the options bag. The server aborts when the abort signal is aborted. To wait for the server to close, await the promise returned from the Deno.serve API.

const ac = new AbortController();

Deno.serve({ signal: ac.signal }, (_req) => new Response("Hello, world"))
 .then(() => console.log("Server closed"));

console.log("Closing server...");

By default Deno.serve prints the message Listening on http://<hostname>:<port>/ on start up. If you like to change this behaviour, you can specify a custom onListen callback.

  onListen({ port, hostname }) {
    console.log(`Server started at http://${hostname}:${port}`);
    // ... more info specific to your server ..
  handler: (_req) => new Response("Hello, world"),

To enable TLS you must specify the key and cert options.

const cert = "-----BEGIN CERTIFICATE-----\n...\n-----END CERTIFICATE-----\n";
const key = "-----BEGIN PRIVATE KEY-----\n...\n-----END PRIVATE KEY-----\n";
Deno.serve({ cert, key }, (_req) => new Response("Hello, world"));