Runtime APIs

Workers run the Cloudflare-aligned runtime surface in a workerd isolate on this node. For identical APIs, use Workers runtime APIs.

export default {
  fetch(request: Request, env: Env, ctx: ExecutionContext): Response {
    return new Response("ok");
  },
} satisfies ExportedHandler<Env>;

Surfaces

Surface	Cloudflare	open-compute
Handlers (fetch, scheduled, queue)	Handlers	handlers
Bindings / env	Bindings	bindings
Cache API	Cache	cache
WebSockets	WebSockets	websockets; hibernation available
TCP sockets	TCP sockets	tcp-sockets
Node.js	Node.js compatibility	nodejs
fetch / Request / Response / Streams / HTMLRewriter / Web Crypto / RPC	Runtime APIs	Aligned; not restated here
Durable Objects / Alarms	Durable Objects	Durable Objects product pages
KV / R2 / D1 / Queues / Workflows	Each product’s docs	Matching product pages on this site

Compatibility

Topic	Cloudflare	open-compute
fetch / Request / Response / Streams / HTMLRewriter / Web Crypto / RPC	Yes	Yes
Alarms, Version Metadata, WebSocket hibernation	Yes	Yes
Vectorize / AI Search (env.AI Markdown subset)	Yes	Yes — see Vectorize and AI Search; full Workers AI inference not provided
Other non-platform products (Browser Run, Hyperdrive, …)	Yes	Not provided — see Unsupported
Outbound TCP / fetch network policy	Cloudflare hosted policy	See TCP sockets
Request-scoped CPU / subrequest quotas	Yes	See Limits