Langfuse/JS SDK

JS SDK

$npx -y @buildinternet/releases show langfuse-js-sdk

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Releases11Avg3/moVersionsv4.6.0 → v5.2.0-beta.2

Apr 17, 2026

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v5.2.0-beta.1...v5.2.0-beta.2

What's Changed

ci: add missing dependabot cooldown by @wochinge in https://github.com/langfuse/langfuse-js/pull/784
fix(langchain): emit tool observations for LangChain tool runs by @hassiebp in https://github.com/langfuse/langfuse-js/pull/787
ci(deps): bump the github-actions group with 2 updates by @dependabot[bot] in https://github.com/langfuse/langfuse-js/pull/788
fix(ci): disable zizmor advanced security to unblock releases by @wochinge in https://github.com/langfuse/langfuse-js/pull/789
fix(ci): allow for immutable GitHub releases by @wochinge in https://github.com/langfuse/langfuse-js/pull/790
fix(ci): fix mutated workfile by @wochinge in https://github.com/langfuse/langfuse-js/pull/791

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v5.2.0-beta.0...v5.2.0-beta.1

Apr 15, 2026

What's Changed

feat(api): update API spec from langfuse/langfuse 07cae52 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/776
chore(ci): optimize e2e langfuse server setup by @hassiebp in https://github.com/langfuse/langfuse-js/pull/777
ci: add dependabot cooldown by @wochinge in https://github.com/langfuse/langfuse-js/pull/778
ci(deps): bump github/codeql-action from 3.35.1 to 4.35.1 in the github-actions group across 1 directory by @dependabot[bot] in https://github.com/langfuse/langfuse-js/pull/780
ci: harden GitHub Actions workflows with zizmor by @wochinge in https://github.com/langfuse/langfuse-js/pull/783

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v5.1.0...v5.2.0-beta.0

Apr 9, 2026

What's Changed

chore(deps-dev): bump happy-dom from 20.8.8 to 20.8.9 by @dependabot[bot] in https://github.com/langfuse/langfuse-js/pull/760
chore(ci): move to blacksmith runners by @nimarb in https://github.com/langfuse/langfuse-js/pull/773
feat(api): update API spec from langfuse/langfuse 1999706 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/774

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v5.0.2...v5.1.0

Apr 1, 2026

What's Changed

feat(api): update API spec from langfuse/langfuse b3adfc3 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/753
fix(langchain): prevent handleChainStart from replacing structured input containing a "content" key by @taiichiro-nagase in https://github.com/langfuse/langfuse-js/pull/749
Fix condition to check content type in promptClients by @budde377 in https://github.com/langfuse/langfuse-js/pull/751
Add option to turn off logging by @szedelenyi in https://github.com/langfuse/langfuse-js/pull/752
Fix string quotes in promptClients.ts by @budde377 in https://github.com/langfuse/langfuse-js/pull/755
feat(api): update API spec from langfuse/langfuse a6c38c6 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/757
chore(deps-dev): bump happy-dom from 20.0.2 to 20.8.8 by @dependabot[bot] in https://github.com/langfuse/langfuse-js/pull/759
ci(GitHub actions): pin GitHub actions, configure dependabot alerts for GitHub actions by @wochinge in https://github.com/langfuse/langfuse-js/pull/761
fix(langchain): handle null tokenUsage by @hassiebp in https://github.com/langfuse/langfuse-js/pull/769
[codex] Fix local experiment ID stability by @hassiebp in https://github.com/langfuse/langfuse-js/pull/770

New Contributors

@taiichiro-nagase made their first contribution in https://github.com/langfuse/langfuse-js/pull/749
@budde377 made their first contribution in https://github.com/langfuse/langfuse-js/pull/751
@szedelenyi made their first contribution in https://github.com/langfuse/langfuse-js/pull/752
@wochinge made their first contribution in https://github.com/langfuse/langfuse-js/pull/761

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v5.0.1...v5.0.2

Mar 13, 2026

What's Changed

feat(api): update API spec from langfuse/langfuse e84ca45 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/747

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v5.0.0...v5.0.1

Mar 10, 2026

Breaking changes and migration guide

Please see our documentation.

What's Changed

feat!: prepare v5 release by @hassiebp in https://github.com/langfuse/langfuse-js/pull/723
feat(api): update API spec from langfuse/langfuse 784ab09 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/735
feat(api): update API spec from langfuse/langfuse 25b5139 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/737
fix(otel): skip base64 decode for URL-based FilePart data in AI SDK media handling by @Tanmay-24 in https://github.com/langfuse/langfuse-js/pull/736
feat(api): update API spec from langfuse/langfuse a93f65a by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/738
feat(api): update API spec from langfuse/langfuse 2eaf041 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/743
fix(otel): allow async mask functions by @hassiebbot in https://github.com/langfuse/langfuse-js/pull/746

New Contributors

@Tanmay-24 made their first contribution in https://github.com/langfuse/langfuse-js/pull/736
@hassiebbot made their first contribution in https://github.com/langfuse/langfuse-js/pull/746

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v4.6.1...v5.0.0

Mar 2, 2026

Breaking changes

Please see the preview migration guide for full details.

What's Changed

feat(api): update API spec from langfuse/langfuse 784ab09 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/735
feat(api): update API spec from langfuse/langfuse 25b5139 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/737
fix(otel): skip base64 decode for URL-based FilePart data in AI SDK media handling by @Tanmay-24 in https://github.com/langfuse/langfuse-js/pull/736
feat(api): update API spec from langfuse/langfuse a93f65a by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/738

New Contributors

@Tanmay-24 made their first contribution in https://github.com/langfuse/langfuse-js/pull/736

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v5.0.0-beta.0...v5.0.0-beta.1

Feb 24, 2026

Breaking changes

Please see the preview migration guide for full details.

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v4.6.1...v5.0.0-beta.0

Feb 11, 2026

What's Changed

feat(api): update API spec from langfuse/langfuse 270f036 by @langfuse-bot in https://github.com/langfuse/langfuse-js/pull/728
feat(datasets): support running experiments on versioned datasets by @marliessophie in https://github.com/langfuse/langfuse-js/pull/727

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v4.6.0...v4.6.1

Feb 9, 2026