# mocha: what changed from 11 to 12

- Product: mocha (https://whatsnew.fyi/product/mocha)
- Vendor: mocha
- Range: changelog entries numbered after v11.8.0 up to and including v12.0.0, stable releases only
- Entries below: 1 release (newest first)
- Resolved: 11 is v11.8.0 and 12 is v12.0.0, the newest stable release of each major we track
- Carrying security changes: 0 · CVEs mentioned: 0 · Mentioning breaking changes: 0 · Removing or deprecating something: 0
- Page: https://whatsnew.fyi/product/mocha/compare/11...12

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

## What changed (2 changes, grouped by kind)

### Fixed

#### v12.0.0 (2026-08-31)

- Fix parsing of negative numbers and quoted strings
- Preserve FIFO descriptors when respawning

## Release notes

### v12.0.0

- Date: 2026-08-31
- Version: v12.0.0
- Original notes: https://github.com/mochajs/mocha/releases/tag/v12.0.0
- Permalink: https://whatsnew.fyi/product/mocha/releases/v12.0.0

- **fixed** — Fix parsing of negative numbers and quoted strings
- **fixed** — Preserve FIFO descriptors when respawning

##### [12.0.0](https://github.com/mochajs/mocha/compare/v12.0.0-rc.6...v12.0.0) (2026-08-31)


###### 🩹 Fixes

* fixup parsing negative numbers and quoted strings ([#6250](https://github.com/mochajs/mocha/issues/6250)) ([2962875](https://github.com/mochajs/mocha/commit/2962875f70df72ec5f0aaba45b3776167902894e))
* preserve FIFO descriptors when respawning ([#6254](https://github.com/mochajs/mocha/issues/6254)) ([3bb317d](https://github.com/mochajs/mocha/commit/3bb317dbe7edc460f44328e630f607aa26773a4d))


###### 📚 Documentation

* fix minor correctness issues ([#6215](https://github.com/mochajs/mocha/issues/6215)) ([e6b9ee7](https://github.com/mochajs/mocha/commit/e6b9ee773481fd739ae24caeb42f32ac0b010f95))
* link to mochajs.org instead of the wiki ([#6216](https://github.com/mochajs/mocha/issues/6216)) ([8720225](https://github.com/mochajs/mocha/commit/8720225413002aeda0a8760e911374fddd6e7b24))


###### 🧹 Chores

* setup Release Please for v12 stable ([#6084](https://github.com/mochajs/mocha/issues/6084)) ([219674f](https://github.com/mochajs/mocha/commit/219674fa5bfaf8fa740fab783344703a2991532d))