Use LangSmith with n8n

LangSmith is a developer platform created by the LangChain team. You can connect your n8n instance to LangSmith to record and monitor runs in n8n, just as you can in a LangChain application.

Connect your n8n instance to LangSmith

1. Log in to LangSmith and get your API key.

2. Set the LangSmith environment variables:

   Variable	Value
   LANGCHAIN_ENDPOINT	"https://api.smith.langchain.com"
   LANGCHAIN_TRACING_V2	true
   LANGCHAIN_API_KEY	Set this to your API key
   LANGCHAIN_PROJECT	Optional project name (defaults to "default")
   LANGCHAIN_CALLBACKS_BACKGROUND	true (asynchronous trace upload)

   If you just created your LangSmith account, you will see a project named "default" only after the first trace is sent from n8n.
   All traces go to this project unless you set LANGCHAIN_PROJECT to a different name.

   Traces may appear with a short delay because LANGCHAIN_CALLBACKS_BACKGROUND defaults to asynchronous submission.
   Set it to false if you prefer synchronous uploads for debugging.

   Set the variables so that they're available globally in the environment where you host your n8n instance. You can do this in the same way as the rest of your general configuration.

3. Restart n8n.

For information on using LangSmith, refer to LangSmith's documentation.