Miniflare — Fully-local simulator for Cloudflare Workers

Miniflare is a simulator for developing and testing Cloudflare Workers.

Originally started as an open-source project, Miniflare has been adopted by Cloudflare to become part of their ecosystem.

Installation per NPM:

npm install -g miniflare

CLI usage is really simple, and is highly configurable using one of its many flags:

$ miniflare worker.js
[mf:inf] Worker reloaded! (97B)
[mf:inf] Listening on :8787
[mf:inf] - http://127.0.0.1:8787

Alternatively you can also use it in your own JS code:

import { Miniflare } from "miniflare";

const mf = new Miniflare({
  script: `
  addEventListener("fetch", (event) => {
    event.respondWith(new Response("Hello Miniflare!"));
  });
  `,
});
const res = await mf.dispatchFetch("http://localhost:8787/");
console.log(await res.text()); // Hello Miniflare!

🔥 Miniflare (GitHub) →