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.