workerd

What it does

workerd is an open-source JavaScript / Wasm server runtime based on the same code that powers Cloudflare Workers. Read the blog post to learn more about workerd: https://blog.cloudflare.com/workerd-open-source-workers-runtime/

The JavaScript / Wasm runtime that powers Cloudflare Workers - cloudflare/workerd

• OS
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  I've been working on this for some time now, starting with vm2, then deno-core for 2 years, and recently rewrote it on rusty_v8 with Claude's help. OpenWorkers lets you run untrusted JS in V8 isolates on your own infrastructure. Same DX as Cloudflare Workers, no vendor lock-in. What works today: fetch, KV, Postgres bindings, S3/R2, cron scheduling, crypto.subtle. Self-hosting is a single docker-compose file + Postgres. Would love feedback on the architecture and what feature you'd want next.

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  Workers Sites2019 · cloudflare.com · ▲148

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  OpenWork – An open-source alternative to Claude CoworkJan 2026 · github.com · ▲231

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