cloudflare/workerd

View on GitHub

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

Detect startup phase vs handling a request Open

cloudflare/workerd#5270 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
DurableObject fails to send logs to Tail Worker when connecting to postgres Open

bug

cloudflare/workerd#5291 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Accept-Encoding Header Mismatch Between Real Request and Worker Open

bug

cloudflare/workerd#5289 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve TLS handshake errors surfaced to fetch() Open

cloudflare/workerd#5286 · 2 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Strange "throw" accounting in chrome dev tools Open

cloudflare/workerd#5301 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — WebSocket Client Connection Hangs Open

cloudflare/workerd#5305 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Chrome dev tools profiling very inconsistent Open

cloudflare/workerd#5316 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Investigate TextEncoder::encodeInto performance Open

cloudflare/workerd#5317 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Investigate UInt8Array::set performance Open

cloudflare/workerd#5318 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Another slow(er) throw performance case Open

cloudflare/workerd#5341 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Investigate issues with ISO 2022 JP decodinbg Open

wpt-conformance

cloudflare/workerd#5379 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Modernize WPT encoding tests that use XHR or ensure we have coverage Open

wpt-conformance

cloudflare/workerd#5392 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Modernize WPT encoding tests that use MessageChannel to transfer Open

wpt-conformance

cloudflare/workerd#5393 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
apply D1 migrations only fails in production Open

cloudflare/workerd#5411 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 ReadableStream forces autoAllocateChunkSize, deviating from spec Open

cloudflare/workerd#5413 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Feature request: AbortSignal support via `signal` in `connect` TCP API Open

feature request

cloudflare/workerd#5432 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Bug Report: workerd crashes in --jitless mode / when wasm is unavailable Open

cloudflare/workerd#5505 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Error running many tests Open

cloudflare/workerd#5507 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`html_rewriter_treats_esi_include_as_void_tag` compatibility_flag not taking effect in workerd Open

cloudflare/workerd#5531 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
very strange behavior related to fetch() Open

cloudflare/workerd#5534 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Runtime APIs: Local image transform binding result does not play nice with `waitUntil` Open

cloudflare/workerd#5537 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Runtime APIs: bad error message related to durable objects SQLite API` Open

cloudflare/workerd#5555 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Awaiting transform of empty response never resolves Open

cloudflare/workerd#5955 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
logging importable exports shows an empty object Open

cloudflare/workerd#5603 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Runtime APIs: No privileged mode option for Containers local development Open

cloudflare/workerd#5609 · 4 comments · 10 reactions · 0 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Need a disconnect hook for streaming response Open

cloudflare/workerd#5611 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
node:console issues Open

nodejs compat

cloudflare/workerd#5615 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
ExecutionContext can't be defined Open

types

cloudflare/workerd#5617 · 13 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Memory leak when writing to a fetch request in stream Open

cloudflare/workerd#5665 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Durable object method with return type "unknown" returns type "never" when used through its stub Open

types

cloudflare/workerd#5675 · 0 comments · 1 reaction · 1 assignee · Indexed Sep 15, 2026
Should the Dynamic Worker Loader API validate the WorkerCode object passed to it? Open

cloudflare/workerd#5681 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Windows support for containers Open

cloudflare/workerd#5695 · 2 comments · 0 reactions · 2 assignees · Indexed Sep 15, 2026
🐛 Bug Report — Runtime APIs: TransformStream with bodies is much slower than other runtimes (10-20x) Open

cloudflare/workerd#5724 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
isomorphic-dompurify fails when used in CF workers. Open

cloudflare/workerd#5752 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Add type definitions for `@cf/black-forest-labs/flux-2-dev` model. Open

cloudflare/workerd#5766 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Query field missing in BGE reranker interface Open

cloudflare/workerd#5998 · 0 comments · 1 reaction · 2 assignees · Indexed Sep 15, 2026
Durable Object Lifecycle Event Emission for Local Dev Tooling Open

feature request

cloudflare/workerd#5835 · 0 comments · 5 reactions · 0 assignees · Indexed Sep 15, 2026
AnalyticsEngineDataPoint.doubles should allow null values Open

cloudflare/workerd#5889 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Containers Beta: Concurrent container starts fail silently - some containers never execute Open

cloudflare/workerd#5996 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
EventTarget is broken and not aligned with spec Open

spec-compliance

cloudflare/workerd#6022 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Undocumented "Queue is overloaded. Please back off." error from sendBatch() Open

cloudflare/workerd#6053 · 1 comment · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Proposal: Allow waitUntil to accept a function returning a Promise for better instrumentation support Open

cloudflare/workerd#6055 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Feature request: binary support for setWebSocketAutoResponse Open

cloudflare/workerd#6062 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
jsg::Lock::logWarning() and reportError() should send warnings/errors to tail workers Open

cloudflare/workerd#6073 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support for Hibernatable RPC Targets in Workers Runtime (Enable `capnweb` hibernation within Durable Objects) Open

cloudflare/workerd#6087 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Python Workers: multipart/form-data body parsing fails at ~1 MB (undocumented limit) Open

cloudflare/workerd#6127 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Question: `wailUntil()` lifetime on SSE response. Open

cloudflare/workerd#6151 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add timeout option to tests Open

cloudflare/workerd#6177 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`placement` in production misroutes `ctx.exports.<WorkerEntrypoint>.fetch()` to main `fetch` (RPC still works) Open

cloudflare/workerd#6215 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
attempting to close `FixedLengthStream` throws `Error: Network connection lost.` Open

Durable Objects

cloudflare/workerd#6685 · 6 comments · 0 reactions · 2 assignees · Indexed Sep 15, 2026

cloudflare/workerd

Get new issues in your inbox