Langfuse SDKs

The Langfuse SDKs are the recommended way to integrate with Langfuse.

Properties:

• Fully async requests, using Langfuse adds almost no latency
• Accurate latency tracking using synchronous timestamps
• IDs available for downstream use
• Great DX when nesting observations
• Cannot break your application, all errors are caught and logged
• Interoperable with Langfuse integrations

JS/TS

npm install langfuse
 
# Node.js < 18
npm install langfuse-node

• Fully typed
• Edge-ready, e.g., Vercel, Cloudflare, Deno
• Works client-side to report user feedback (with only the public_key)

→ For more information, see JS/TS (Node.js, Edge) and JS/TS (Web) docs.

Python

pip install langfuse

• Uses Pydantic for typing and validation
• Langchain callback handler

→ For more information, see Python docs.