captun

cap[nweb] tun[nel]: a tiny, fast public tunnel for local HTTP servers.

Run this with something listening on port 3000:

npx captun 3000

You get a URL like:

https://abc123.captun.sh

Requests to that URL are forwarded to your local server until you stop the process.

From code

You don't need to run a local server. Just a fetch function:

import { createCaptunTunnel } from "captun";

const tunnel = await createCaptunTunnel({
  fetch: (request) => {
    const url = new URL(request.url);
    return Response.json({ method: request.method, path: url.pathname });
  },
});

console.log(tunnel.url);

Try it in this tab

This works in any environment supported by capnweb, so you can run a "server" basically anywhere, even the browser.

Edit the fetch function, create a tunnel, then the iframe below will load the public URL.

idle

Bring your own Cloudflare account

npx captun deploy

Source: github.com/iterate/captun