how to add new endpoints in langgraph? or use fastapi for langgraph?

[junan-trustarc]

I deployed to langgraph-cloud, I just need additional rest endpoints for different purpose.
since langgraph cloud exposed pre-defined langgraph endpoints only, is there anyway to add new endpoint?

or can we add pre-defined langgraph endpoints into just normal fast API ?

[gourishankarseal]

Yes using an api router within fastapi you can wrap your langgraph nodes (functions) as endpoints. Using a pydantic model you can add structured output from the called node and return a json response. I would typically do this in a sequential flow graph where the terminal node is responding to the request.

On the other hand if you want a supervisor to orchestrate multiple react agents thats also possible. In that case the request will hit the supervisor which will route the request to the appropriate agent

https://langchain-ai.github.io/langgraph/tutorials/multi_agent/agent_supervisor/#set-up-agent-communication