Platform

Edge Workers

Run user-defined JS at the edge — Node-isolate sandbox or a safe-template DSL.

▸ How it works

Two runtimes share the same routing layer. (1) The **Node-isolate sandbox** spawns a Node subprocess via Port with strict resource caps (max heap, max CPU ms, no net/fs by default); the worker code is evaluated in a fresh V8 isolate per request. (2) The **safe template DSL** is a pure-Elixir interpreter for `status:`, `header:`, `body:`, `{{vars}}`, and `if/end` — no JS, no syntax errors crashing the host. Both runtimes attach OTel spans to the request automatically.

▸ What this lets you do

✓ Serve customer-defined logic without giving them a server
✓ Sandbox the dangerous stuff: safe-template handles 95% of needs
✓ Per-invocation metrics + traces — workers observe themselves
✓ VS Code-style editor in the dashboard for live edits

▸ Get it running

1 Open `Workers` → `+ New worker`, pick runtime (`js` or `safe`)
2 Edit code in the VS Code-style editor; save deploys instantly
3 Hit your worker at `https://YOUR-FUNNEL/w/<worker-id>`

▸ Code examples

# workers/hello-template
status: 200
header: Content-Type: application/json
body: {
  "hello": "{{ request.query.name | default: "world" }}",
  "ts":    "{{ now }}"
}

Where to find it

/app/p/:org/:project/workers

Open in app →