OSS-backed debugging labs across ecosystems.
Each lab is reverted from a real public bug-fix commit. Filter by language, stack, topic, difficulty, and readiness — drafts stay unplayable until a human review marks them ready.
Axios keeps a stale content-type for React Native FormData
axios/axios · API & Request Flow
- Fix
- 7b3369a
- Parent
- b0771a3
- Files
- 463
- LOC
- 67,806
- License
- MIT
Symbol keys dropped when merging axios request config
axios/axios · API & Request Flow
- Fix
- f70731b
- Parent
- 315ec44
- Files
- 464
- LOC
- 65,972
- License
- MIT
Fastify trusts forwarded host and protocol without a socket guard
fastify/fastify · API & Request Flow
- Fix
- 21b4c3c
- Parent
- 9bbf609
- Files
- 385
- LOC
- 79,438
- License
- MIT
Fastify native server close lifecycle regression
fastify/fastify · API & Request Flow
- Fix
- c2ba18c
- Parent
- d33f017
- Files
- 385
- LOC
- 79,226
- License
- MIT
Knex omits RETURNING for an empty-row SQLite insert
knex/knex · Database
- Fix
- f44f75a
- Parent
- 8198fa6
- Files
- 591
- LOC
- 112,949
- License
- MIT
ignoringCollectionOrder false positives with duplicate elements
assertj/assertj · API & Request Flow
- Fix
- 4097e94
- Parent
- e5e027a
- Repo scale
- 5,242 upstream
- Snapshot
- 1,845 files
- License
- Apache-2.0
Repo scale: 5,242 upstream files · Packaged snapshot: 1,845 files
Packaging: needs_packaging: java sandbox execution not configured in local pipeline
validate invalid route logLevel at registration (#6523)
fastify/fastify · Secrets & Auth
- Fix
- 2ae3e1d
- Parent
- d76dbcd
- Files
- 385
- LOC
- 79,304
- License
- MIT
Packaging: visible failed after gold
update() parent pointers not updated after recursive merge with JSON_...
nlohmann/json · Date/Time
- Fix
- 584e6b1
- Parent
- a69a42a
- Repo scale
- 1,205 upstream
- Snapshot
- 331 files
- License
- MIT
Repo scale: 1,205 upstream files · Packaged snapshot: 331 files
Packaging: Needs hidden test authoring: upstream commit did not provide a second split test.
Don't change relative location header on manual redirect (#1105)
node-fetch/node-fetch · API & Request Flow
- Fix
- 5304f3f
- Parent
- f5d3cf5
- Files
- 53
- LOC
- 7,365
- License
- MIT
Packaging: visible failed after gold
deprecate Accept-Charset header
pallets/werkzeug · API & Request Flow
- Fix
- 97dec52
- Parent
- 68e1b7b
- Files
- 291
- LOC
- 27,879
- License
- BSD-3-Clause
Packaging: Secret scan redacted: docs/serving.rst, src/werkzeug/datastructures/auth.py, src/werkzeug/debug/__init__.py, src/werkzeug/urls.py, tests/test_http.py
infoDraft labs are not playable. Status reflects honest packaging + review state, never a fake availability.
Repos we mine
Source repos in the mining pipeline. Packs open as drafts clear packaging and human review.
Export OSS Labs to your own machine.
A planned local mode will let advanced users export a lab and run it in their own editor and terminal — keeping the guided browser experience as the default. Not yet available; this is a roadmap teaser, not a shipped feature.