npm
chai
BDD/TDD assertion library for node.js and the browser. Test framework agnostic.
assertionsbddchaijavascripttdd
Release cadenceSeveral a day
Last releaseSep 30, 2026
Open advisories0
Changelog quality100% curated
GitHub Releases + CHANGELOG
Release history SecurityYou're on
86 older or filtered releases not shown.
Upgrade guides
Breaking changes and a migration checklist for each major versionchai 5 → 65.3.3 → 6.3.0Sep 30, 2026 BreakingBreaking1Security1New2Changed1Fixed9Other114chai 4 → 54.5.0 → 5.3.3Aug 22, 2025 BreakingBreaking6Platform3New4Changed16Fixed12Other47chai 3 → 43.5.0 → 4.5.0Jul 25, 2024 BreakingBreaking16Security2Platform3New31Changed9Fixed43Other48chai 2 → 32.3.0 → 3.5.0Jan 28, 2016 Unknownchai 1 → 21.10.0 → 2.3.0Apr 26, 2015 Unknownchai 0.5 → 10.5.3 → 1.10.0Nov 10, 2014 BreakingBreaking5New46Changed26Fixed33Other173chai 0.4 → 0.50.4.2 → 0.5.3Apr 21, 2012 Unknownchai 0.3 → 0.40.3.4 → 0.4.2Feb 28, 2012 Unknownchai 0.2 → 0.30.2.4 → 0.3.4Feb 23, 2012 Unknownchai 0.1 → 0.20.1.7 → 0.2.4Feb 2, 2012 Unknownchai 0.0 → 0.10.0.2 → 0.1.7Jan 25, 2012 Unknown
VersionChannelDateChangesSecurity
6.3.0 StableSep 30, 2026Security1Fixed7Other826.2.2 youStableDec 22, 2025Fixed1Other106.2.1 StableNov 11, 2025Changed1Other206.2.0 StableSep 27, 2025New16.1.0 StableSep 27, 2025New1Other16.0.1 StableAug 22, 2025Fixed16.0.0 StableAug 22, 2025Breaking1Other15.3.3 StableAug 22, 2025Fixed1Other25.3.2 StableAug 22, 2025New1Fixed15.3.1 StableAug 18, 2025Other15.3.0 StableAug 18, 2025Other15.2.2 StableAug 18, 2025Other15.2.1 StableJul 8, 2025Platform1Other105.2.0 StableFeb 14, 2025Breaking1New1Fixed2Other45.1.2 StableOct 23, 2024New1Other85.1.1 StableMay 9, 2024Fixed1Other35.1.0 StableFeb 12, 2024New1Changed1Fixed2Other35.0.3 StableJan 25, 2024Fixed15.0.2 StableJan 25, 2024Changed1Fixed2Other65.0.0 StableDec 28, 2023Breaking3Platform1Changed9Fixed2Other6