Examples

These small Wrangler projects demonstrate the Workers platform that celld supports, one service or API at a time:

• hello/ — a stateless Worker fetch handler
• webapi/ — common Web Platform APIs
• static-assets/ — an asset-only website with headers and redirects
• counter/ — a SQLite-backed Durable Object
• vectordb/ — nearest-color search with a per-object vec0 index
• d1/ — a guestbook on a D1 database
• r2/ — object reads, writes, and deletes on an R2 bucket
• kv/ — key reads, writes, and deletes in a KV namespace
• queues/ — a producer and a consumer, with retries and a dead-letter queue
• async/ — a timer and asynchronous Durable Object storage
• body/ — request and response bodies
• router/ — Worker-to-Durable-Object routing
• wsecho/ — WebSocket echo with hibernation
• wsclient/ — outbound WebSocket client from a Durable Object
• alarm/ — a Durable Object alarm handler
• cron/ — a cron trigger that logs each tick
• workflow/ — a Workflow that builds a report in one durable step
• rpc/ — Durable Object method calls through JS RPC
• dynamic-worker-tails/ — a runtime-loaded Worker with a Tail Worker
• facets/ — a Durable Object facet over a class the Worker Loader starts
• container/ — a Durable Object that supervises a container with @cloudflare/containers; needs npm install and a Docker or Podman CLI
• sandbox/ — the Cloudflare Sandbox SDK: commands, files, and processes in a container per sandbox; needs npm install and a Docker or Podman CLI
• pi/ — the PiHarness agent loop in a Durable Object
• opencode/ — the OpenCode Workerd SDK in a Durable Object
• python/ — a Python Worker that summarizes HTML with a vendored package; needs uv run pywrangler sync first (see Python Workers)
• wasm/ — a Durable Object counter in Rust, compiled to Wasm with workers-rs; needs a build step first (see its README)

Deploy an example from its directory to the same bucket the nodes use:

celld deploy . --bucket s3://my-cells-bucket

The counter example uses the name query parameter as the Durable Object name. It uses default when the parameter is absent. Send requests for different names to demonstrate independent cells:

curl 'http://127.0.0.1:8080/increment?name=alpha'
curl 'http://127.0.0.1:8080/increment?name=beta'
curl 'http://127.0.0.1:8080/increment?name=alpha'

A fleet can place the named cells on different nodes, and each cell keeps an independent counter.

They are examples, not the complete compatibility test suite.