JS SDK

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v4.0.0-beta.4...v4.0.0-beta.4

What's Changed

• chore(deps-dev): bump happy-dom from 14.12.3 to 15.10.2 by @dependabot[bot] in https://github.com/langfuse/langfuse-js/pull/584
• chore: bump vitest and remove outdated esbuild by @hassiebp in https://github.com/langfuse/langfuse-js/pull/587
• feat(tracing): add getActiveTraceID by @hassiebp in https://github.com/langfuse/langfuse-js/pull/589
• feat(tracing): isolated tracer provider by @hassiebp in https://github.com/langfuse/langfuse-js/pull/588

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v4.0.0-beta.2...v4.0.0-beta.3

4.0.0-beta.2 (2025-08-08)

🐛 Bug Fixes

• span-processor: drop dep on Buffer (28c9985)

📚 Documentation

• add jsdoc for client and otel package (16c6366)
• add jsdoc for openai and tracing package (e2182ec)

4.0.0-beta.1 (2025-08-07)

What's Changed

• fix(langchain-azure): set refusal error on trace from chain error by @hassiebp in https://github.com/langfuse/langfuse-js/pull/576

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.38.3...v3.38.4

What's Changed

• chore(evals): whitelist langfuse-native environment for prompt experiment trace creation by @marliessophie in https://github.com/langfuse/langfuse-js/pull/571

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.38.2...v3.38.3

What's Changed

• fix(langchain-azure): add refusal error to trace by @hassiebp in https://github.com/langfuse/langfuse-js/pull/575

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.38.1...v3.38.2

What's Changed

• fix(langchain-azure): add error message on refusal by @hassiebp in https://github.com/langfuse/langfuse-js/pull/573

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.38.0...v3.38.1

What's Changed

• feat(prompts): message placeholders in js sdk by @nimarb in https://github.com/langfuse/langfuse-js/pull/568

New Contributors

• @nimarb made their first contribution in https://github.com/langfuse/langfuse-js/pull/568

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.37.6...v3.38.0

What's Changed

• fix(prompts): escape json in getLangchainPrompt by @hassiebp in https://github.com/langfuse/langfuse-js/pull/567

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.37.5...v3.37.6

What's Changed

• fix(core): update timeout and propagate across HTTP client calls by @hassiebp in https://github.com/langfuse/langfuse-js/pull/556
• chore: update public api client by @hassiebp in https://github.com/langfuse/langfuse-js/pull/564

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.37.4...v3.37.5

What's Changed

• fix(vercel-ai-sdk): missing generation metatdata for AI SDK logging (#542) by @hassiebp in https://github.com/langfuse/langfuse-js/pull/543
• fix: log 429 error details without throwning an exception (#544) by @hassiebp in https://github.com/langfuse/langfuse-js/pull/545
• chore(vercel): remove log message on input parse failure by @hassiebp in https://github.com/langfuse/langfuse-js/pull/549
• fix(core): do not log warning messages for explicitly disabled client by @hassiebp in https://github.com/langfuse/langfuse-js/pull/550
• fix(langchain): azure model name parsing from response metadata by @hassiebp in https://github.com/langfuse/langfuse-js/pull/554

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.37.2...v3.37.4

What's Changed

• Remove Langfuse is disabled log message from LangfuseCore by @howinator in https://github.com/langfuse/langfuse-js/pull/536
• feat: add metadata field to scores by @davidmc971 in https://github.com/langfuse/langfuse-js/pull/533
• fix: correct return type for dataset item link function call by @austin-tildei in https://github.com/langfuse/langfuse-js/pull/535
• fix(langfuse-vercel): OTEL SDK v2 compatibility by @hassiebp in https://github.com/langfuse/langfuse-js/pull/537

New Contributors

• @howinator made their first contribution in https://github.com/langfuse/langfuse-js/pull/536
• @davidmc971 made their first contribution in https://github.com/langfuse/langfuse-js/pull/533
• @austin-tildei made their first contribution in https://github.com/langfuse/langfuse-js/pull/535

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.37.1...v3.37.2

What's Changed

• chore(deps): bump axios from 1.7.4 to 1.8.2 by @dependabot in https://github.com/langfuse/langfuse-js/pull/526
• chore: pin swagger-typescript-api by @hassiebp in https://github.com/langfuse/langfuse-js/pull/531
• fix(langchain): use message.role for ChatMessages by @hassiebp in https://github.com/langfuse/langfuse-js/pull/534

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.37.0...v3.37.1

What's Changed

• feat(openai): add Response API support by @hassiebp in https://github.com/langfuse/langfuse-js/pull/523
• test(langchain): link chatprompt via ChatMessageTemplate by @hassiebp in https://github.com/langfuse/langfuse-js/pull/516

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.36.0...v3.37.0

What's Changed

• feat(client): add environment to traces, scores, obs by @hassiebp in https://github.com/langfuse/langfuse-js/pull/514

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.35.3...v3.36.0

What's Changed

• fix(langchain): cached token usage details by @hassiebp in https://github.com/langfuse/langfuse-js/pull/512
• fix(openai): preserve return types for wrapped methods by @hassiebp in https://github.com/langfuse/langfuse-js/pull/513

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.35.2...v3.35.3

What's Changed

• feat(prompts): add commit message by @hassiebp in https://github.com/langfuse/langfuse-js/pull/508

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.35.1...v3.35.2

• perf(ingestion): make event and batch size limits configurable

Full Changelog: https://github.com/langfuse/langfuse-js/compare/v3.35.0...v3.35.1