
langfuse-js
🪢 Langfuse JS/TS SDKs - Instrument your LLM app and get detailed tracing/observability. Works with any LLM or framework
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langfuse-js is a modular mono repo for the Langfuse JS/TS client libraries. It includes packages for Langfuse API client, tracing, OpenTelemetry export helpers, OpenAI integration, and LangChain integration. The SDK is currently in version 4 and offers universal JavaScript environments support as well as Node.js 20+. The repository provides documentation, reference materials, and development instructions for managing the monorepo with pnpm. It is licensed under MIT.
README:
Modular mono repo for the Langfuse JS/TS client libraries.
[!IMPORTANT] The SDK was rewritten in v4 and will be released soon. Refer to the v4 migration guide for instructions on updating your code.
Package | NPM | Description | Environments |
---|---|---|---|
@langfuse/client | Langfuse API client for universal JavaScript environments | Universal JS | |
@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 |
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
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