LangChain Deploy Integration

Overview

Deploy LangChain chains and agents as APIs using LangServe (Python) or custom Express/Fastify servers (Node.js). Covers containerization, cloud deployment, health checks, and production observability.

Option A: LangServe API (Python)

# serve.py
from fastapi import FastAPI
from langserve import add_routes
from langchain_openai import ChatOpenAI
from langchain_core.prompts import ChatPromptTemplate
from langchain_core.output_parsers import StrOutputParser

app = FastAPI(title="LangChain API", version="1.0.0")