cloudflare/workerd
The JavaScript / Wasm runtime that powers Cloudflare Workers observed · 2026-08-28
Health v2 · maintenance only
95/100
- Activity 99
- Release rhythm 87
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 1
- age_days: 1448
- days_rel: 7
- days_push: 7
- n_releases_24m: 494
Adoption not part of the score
8640 stars · 717 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
workerd is the open-source JavaScript/Wasm server runtime based on the same code that powers Cloudflare Workers. It can be used as an application server to self-host Workers-compatible apps, for local development and testing, or as a programmable HTTP proxy.
Use cases
- self-host cloudflare workers applications
- run workers code locally for development and testing
- build a programmable http proxy
- run javascript/wasm server applications outside cloudflare
- test worker scripts before deployment
- host edge-style serverless apps on my own infrastructure
When to choose
- you need bug-for-bug compatibility with the Cloudflare Workers runtime
- you want to self-host applications written for Workers
- you want realistic local testing instead of Node.js-based simulation
- you need a standards-based JavaScript server runtime with web platform APIs
When to avoid
- you need to run untrusted code - workerd is not a hardened sandbox
- you want a general-purpose CLI or GUI JavaScript runtime like Node.js
- you need a simple scripting runtime without server capabilities
Facets
application · maturity active
http-server wasm rpc middleware web-development developer-tools cloud-computing self-hosted apis windows cross-platform cpp self-hosted javascript-runtime serverless cloudflare-workers v8 edge-computing nanoservices http-proxy linux macos docker
6 sources
- readme: https://github.com/cloudflare/workerd · fetched 2026-08-28 · 99d57cefa48f
- homepage: https://blog.cloudflare.com/workerd-open-source-workers-runtime/ · fetched 2026-08-29 · fd4ac35ac2a7
- site_page: https://blog.cloudflare.com/tag/developer-documentation · fetched 2026-08-29 · 12bb2ca0cd87
- site_page: https://www.cloudflare.com/about · fetched 2026-08-29 · 966c42a9a06f
- site_page: https://developers.cloudflare.com/workers/platform/compatibility-dates · fetched 2026-08-29 · 4c1f1989cfd2
- site_page: https://developers.cloudflare.com/ · fetched 2026-08-29 · 1b8430a97c92
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| cloudflare/workerd | main | 95 |
For agents
markdown · JSON · MCP: product_card(name="cloudflare/workerd")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem