Zero on Cloudflare

A Zero native executable, running in a Cloudflare Container, exposed by a tiny Worker.

• Live: https://zero.coey.dev
• Source: https://github.com/acoyfellow/zero-cloudflare-hello
• Deploy: https://deploy.workers.cloudflare.com/?url=https://github.com/acoyfellow/zero-cloudflare-hello

curl https://zero.coey.dev
# hello from Zero on Cloudflare infra

The program behind that response:

pub fun main(world: World) -> Void raises {
    check world.out.write("hello from Zero on Cloudflare infra\n")
}

How it works

request → Worker → Container → Zero ELF → stdout response

Zero emits a Linux executable. Cloudflare Containers run Linux executables. The Worker forwards HTTP to a small container adapter, which runs the Zero binary and returns stdout.

Repo map

Path	Purpose
hello.0	Zero source.
artifacts/hello-linux-musl-x64	261-byte deployable ELF.
src/index.ts	Worker → Container routing.
server.mjs	Container HTTP adapter.
Dockerfile	Container image.
wrangler.jsonc	Cloudflare deployment config.

Deploy

Click the button above. It forks this repo and deploys the Worker + Container. First-time Containers can take a few minutes to become ready.

The tiny ELF is committed so one-click deploy does not need to install the experimental Zero compiler.

Rebuild the Zero binary

curl -fsSL https://zerolang.ai/install.sh | bash
export PATH="$HOME/.zero/bin:$PATH"
npm run build:zero

Scope

This demonstrates Zero native output on Cloudflare Containers. Zero does not yet expose a production native HTTP server runtime, so the container includes a visible HTTP adapter.