langfuse-js

Modular mono repo for the Langfuse JS/TS client libraries.

Packages

[!IMPORTANT] The SDK was rewritten in v2 and released on December 18, 2023. Refer to the v2 migration guide for instructions on updating your code.

Package	NPM	Environments
langfuse		Node >= 18, Web, Edge
langfuse-node		Node < 18
langfuse-langchain		Node >= 20, Web, Edge
langfuse-vercel (beta)		Node >= 20, Web, Edge

Documentation

• Docs: https://langfuse.com/docs/sdk/typescript
• Reference: https://js.reference.langfuse.com

License

MIT

Credits

Thanks to the PostHog team for the awesome work on posthog-js-lite. This project is based on it as it was the best starting point to build a modular SDK repo to support various environments.