cloudflare/workerd

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The JavaScript / Wasm runtime that powers Cloudflare Workers

Stars: 8.7k
Forks: 739
Open beginner issues: 0
Indexed issues: 464
Avg merge: 2d 20h
Merged PRs (30d): 174

Dominant language: C++
License: Apache-2.0
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Open All

464 open issues indexed

`setTimeout` and `fetch` never callback/fulfill when DO gets evicted Open

Durable Objects

cloudflare/workerd#1185 · 8 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
🐛 BUG: Global scope is reused for all worker code, different from cloud environment Open

bug Durable Objects

cloudflare/workerd#1256 · 7 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
🚀 Feature Request: Ability to delete only a subset of DO's storage keys. Open

cloudflare/workerd#5264 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Small response body writes get sent out on individual TCP packets (astro + cloudflare) Open

cloudflare/workerd#1235 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Runtime APIs: `setAlarm` throws `tried to arm Event after it was destroyed` Open

Durable Objects

cloudflare/workerd#1272 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Fetch's body output causes a crash Open

cloudflare/workerd#1275 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Cannot import v8, cannot serialize Open

cloudflare/workerd#1278 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Feature request - Configurable subrequest limit Open

cloudflare/workerd#1291 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Runtime APIs Pages env.ASSET.fetch rewrites html absolute paths to be relitive Open

cloudflare/workerd#1296 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
workerd: macOS symbolication does not work Open

bug macos tooling

cloudflare/workerd#1335 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
crypto: 100,000 iterations of PBKDF2 is insecure Open

feature request workers-runtime

cloudflare/workerd#1346 · 18 comments · 16 reactions · 0 assignees · Indexed Sep 15, 2026
Support R2 copy object Open

feature request

cloudflare/workerd#1349 · 3 comments · 11 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 BUG: fetch in wrangler dev with sveltekit results in SSLV3_ALERT_HANDSHAKE_FAILURE Open

bug

cloudflare/workerd#2589 · 13 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 BUG: Alarm doesn't work correctly, when calling API many time Open

bug

cloudflare/workerd#1358 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 BUG: console.dir support Open

bug

cloudflare/workerd#2247 · 3 comments · 4 reactions · 1 assignee · Indexed Sep 15, 2026
🐛 Bug Report — Runtime APIs: service workers don't use Node-style logging Open

feature request nodejs compat

cloudflare/workerd#1362 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
🐛 BUG:wrangler 3.15.0 still not work on Raspberry Pi OS bookworm Open

bug

cloudflare/workerd#5013 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Runtime APIs: first request to restarted `workerd` instance on same port from `workerd` fails with `Internal Server Error` on Windows Open

cloudflare/workerd#1376 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 BUG: ‘Step over’ on `await` clause in debugger completely resumes execution Open

bug

cloudflare/workerd#2962 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Feature request: add offset to SQLite's error mesages Open

feature request

cloudflare/workerd#1391 · 3 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 BUG: In Vectorize filter by metadata keys not working. Open

cloudflare/workerd#2077 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Feature request: (intermediate value).require is not a function / import.meta is not supported Open

feature request nodejs compat web platform

cloudflare/workerd#2963 · 13 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
`MY_QUEUE.send()` regularly fails with `Internal Server Error` at runtime Open

cloudflare/workerd#1483 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
When using Dev Tools, creating a CPU profile only shows a general line, no details provided Open

bug

cloudflare/workerd#2368 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support passing a AbortSignal to cache.match Open

feature request

cloudflare/workerd#1505 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Support additional types in HTMLRewriter Open

feature request

cloudflare/workerd#1508 · 8 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 BUG: Uncaught error when initializing two top level WASM modules Open

bug

cloudflare/workerd#1529 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 BUG: Brotli response not decoded Open

feature request

cloudflare/workerd#1587 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 BUG: D1 does not VACUUM causing performance issues Open

bug D1

cloudflare/workerd#1618 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Circular `require()` not supported Open

api bug frameworks nodejs compat

cloudflare/workerd#1637 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — ports on Windows Open

bug local dev

cloudflare/workerd#1664 · 1 comment · 2 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 `fetch` rejects any custom Fetcher instance Open

feature request

cloudflare/workerd#1686 · 1 comment · 3 reactions · 0 assignees · Indexed Sep 15, 2026
R2 Bindings do not allow dates past 2189 Open

cloudflare/workerd#1687 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Runtime APIs: successive `fetch()`es fail if upstream doesn't consume body Open

bug

cloudflare/workerd#1741 · 2 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Feature Request — Runtime APIs — Subrequest Counter Open

feature request

cloudflare/workerd#1815 · 8 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
🐛 BUG: Network Request Response no data available for large responses Open

bug local dev

cloudflare/workerd#1853 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Request: Improve Tail Worker types in `@cloudflare/workers-types` Open

types

cloudflare/workerd#1860 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Feature Request: Cloudflare D1 SQLite `generate_series` function Open

cloudflare/workerd#1888 · 0 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — fetch fails locally with custom port on HTTPS Open

cloudflare/workerd#1897 · 4 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
JSPRC pipelining support for non-plain-objects Open

cloudflare/workerd#1898 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Feature 🚀 : Add a new `Env` type that can be used and extended externally Open

feature request types

cloudflare/workerd#1899 · 1 comment · 2 reactions · 1 assignee · Indexed Sep 15, 2026
🐛 Bug Report — Runtime APIs: URL.searchParams performance issue Open

cloudflare/workerd#1903 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 BUG: Workers TTFB slows down based on unused dynamic imports (additional modules) Open

bug

cloudflare/workerd#2372 · 6 comments · 22 reactions · 0 assignees · Indexed Sep 15, 2026
I should have added that `wasm_bindgen` needs to be v0.2.78, not current version. So Cargo.toml should contain: Open

cloudflare/workerd#1929 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
python: zoneinfo is pretty much broken Open

python

cloudflare/workerd#1972 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Python workers: pgwasm working in local dev but failing in remote dev and deployment Open

python

cloudflare/workerd#1973 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Feature Request: version metadata `message` property Open

cloudflare/workerd#1983 · 3 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
🐛 Bug Report — WARNING: Tried to access method or property 'ping' on a Service Binding or Durable Object stub. Are you trying to use RPC? Open

cloudflare/workerd#2001 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Infinite loop crash under WSL - failed: connect(): Cannot assign requested address; address = 127.0.0.1:60743 Open

cloudflare/workerd#2018 · 3 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — `.getWebSocketAutoResponseTimestamp()` not returning the correct timestamp Open

cloudflare/workerd#2025 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

cloudflare/workerd

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