How to get trace data with langfuse-langchain in JS/TS?

[AdiletBekmuratov]

I searched all documentation and only found how to create and update traces. Is there any way to get a trace after its creation via langfuse-langchain in JS/TS SDK? I'm able to get trace ID with langfuseHandler.traceId

"langfuse-langchain": "^3.9.0"

[marcklingen]

what do you want to do with the trace? currently there is no get by id function in js but you can always just use the rest api directly: https://api.reference.langfuse.com

[AdiletBekmuratov]

I want to get usage (tokens, cost) and save it in my working db for each request. Langchain's usage count doesn't work properly in cases of agents and tools used, so I decided to get the tokens count from Langfuse.