🪢 Langfuse JS/TS SDKs - Instrument your LLM app and get detailed tracing/observability. Works with any LLM or framework
159
stars
814
commits
TypeScript
primary language
Sep 11, 2026
updated
README
langfuse-js
Modular mono repo for the Langfuse JS/TS client libraries.
Packages
[!IMPORTANT] The SDK was rewritten in v5 and released in March 2026. Refer to the v5 migration guide for instructions on updating your code.
The unscoped npm packages
langfuse,langfuse-core,langfuse-node, andlangfuse-langchainbelong to the legacy v3 SDK. For new integrations use the@langfuse/*scoped packages below — start with @langfuse/tracing + @langfuse/otel for tracing.
| Package | NPM | Description | Environments |
|---|---|---|---|
| @langfuse/client |  | Langfuse API client for universal JavaScript environments | Universal JS |
| @langfuse/browser |  | Langfuse browser SDK for public-key score ingestion | Browser |
| @langfuse/tracing |  | Langfuse instrumentation methods based on OpenTelemetry | Node.js 20+ |
| @langfuse/otel |  | Langfuse OpenTelemetry export helpers | Node.js 20+ |
| @langfuse/openai |  | Langfuse integration for OpenAI SDK | Universal JS |
| @langfuse/langchain |  | Langfuse integration for LangChain | Universal JS |
| @langfuse/vercel-ai-sdk |  | Langfuse integration for AI SDK v7 | Universal JS |
Documentation
Development
This is a monorepo managed with pnpm. See CONTRIBUTING.md for detailed development instructions.
Quick start:
pnpm install # Install dependencies
pnpm build # Build all packages
pnpm test # Run tests
pnpm ci # Run full CI suite
License
Contributors
Similar repos
Languages
TypeScript
99.4%
🪢 Langfuse JS/TS SDKs - Instrument your LLM app and get detailed tracing/observability. Works with any LLM or framework
159
stars
814
commits
TypeScript
primary language
Sep 11, 2026
updated
README
langfuse-js
Modular mono repo for the Langfuse JS/TS client libraries.
Packages
[!IMPORTANT] The SDK was rewritten in v5 and released in March 2026. Refer to the v5 migration guide for instructions on updating your code.
The unscoped npm packages
langfuse,langfuse-core,langfuse-node, andlangfuse-langchainbelong to the legacy v3 SDK. For new integrations use the@langfuse/*scoped packages below — start with @langfuse/tracing + @langfuse/otel for tracing.
| Package | NPM | Description | Environments |
|---|---|---|---|
| @langfuse/client | | Langfuse API client for universal JavaScript environments | Universal JS |
| @langfuse/browser | | Langfuse browser SDK for public-key score ingestion | Browser |
| @langfuse/tracing | | Langfuse instrumentation methods based on OpenTelemetry | Node.js 20+ |
| @langfuse/otel | | Langfuse OpenTelemetry export helpers | Node.js 20+ |
| @langfuse/openai | | Langfuse integration for OpenAI SDK | Universal JS |
| @langfuse/langchain | | Langfuse integration for LangChain | Universal JS |
| @langfuse/vercel-ai-sdk | | Langfuse integration for AI SDK v7 | Universal JS |
Documentation
Development
This is a monorepo managed with pnpm. See CONTRIBUTING.md for detailed development instructions.
Quick start:
pnpm install # Install dependencies
pnpm build # Build all packages
pnpm test # Run tests
pnpm ci # Run full CI suite
License
Similar repos
Contributors
Languages
TypeScript
99.4%