npm
through2
Tiny utilities for inserting transformation logic into Node.js stream and Web Streams pipelines
streamtransformtransformstreamweb-streamsasync-iterablepipeline
Release cadenceDaily
Last releaseOct 19, 2026
Open advisories0
Changelog quality46% curated
GitHub Releases, gaps for some releases
Release history Security
38 older or filtered releases not shown.
Upgrade guides
Breaking changes and a migration checklist for each major versionthrough2 4 → 54.0.2 → 5.0.12Oct 19, 2026 UnknownOther4through2 3 → 43.0.2 → 4.0.2Jun 30, 2020 Unknownthrough2 2 → 32.0.5 → 3.0.2Jun 24, 2020 Unknownthrough2 1 → 21.1.1 → 2.0.5Nov 6, 2018 Unknownthrough2 0.6 → 10.6.5 → 1.1.1Aug 11, 2014 Unknownthrough2 0.5 → 0.60.5.1 → 0.6.5Apr 9, 2015 Unknownthrough2 0.4 → 0.50.4.2 → 0.5.1Jun 4, 2014 Unknownthrough2 0.3 → 0.40.3.0 → 0.4.2May 22, 2014 Unknownthrough2 0.2 → 0.30.2.3 → 0.3.0Jan 3, 2014 Unknownthrough2 0.1 → 0.20.1.0 → 0.2.3Sep 26, 2013 Unknownthrough2 0.0 → 0.10.0.5 → 0.1.0Aug 5, 2013 Unknown
VersionChannelDateChangesSecurity
5.0.12 StableOct 19, 2026Other15.0.11 StableJul 30, 2026Other15.0.10 StableJul 29, 2026Other25.0.9 StableJul 29, 2026No changes listed5.0.8 StableJul 29, 2026No changes listed5.0.7 StableJul 23, 2026No changes listed5.0.6 StableJul 21, 2026No changes listed5.0.5 StableJul 3, 2026No changes listed5.0.4 StableJul 1, 2026No changes listed5.0.3 StableJun 23, 2026No changes listed5.0.2 StableJun 22, 2026No changes listed5.0.1 StableMay 15, 2026No changes listed5.0.0 StableMay 7, 2026No changes listed4.0.2 youStableJun 30, 2020No notes published4.0.1 StableJun 27, 2020No notes published4.0.0 StableJun 27, 2020No notes published3.0.2 StableJun 24, 2020No changes listed3.0.1 StableMar 1, 2019No changes listed3.0.0 StableNov 6, 2018No changes listed2.0.5 StableNov 6, 2018No changes listed