Install Open LangGraph Server

Open LangGraph Server is a library that integrates seamlessly into your existing JavaScript projects. Choose the installation method that best fits your workflow.

Before you start

You'll need Node.js 18 or later
Have a LangGraph.js graph implementation ready

Install with pnpm

Add Open LangGraph Server to your JavaScript or TypeScript project:

pnpm add @langgraph-js/pure-graph

Required peer dependencies

You'll also need to install LangGraph.js core dependencies:

# Core LangGraph dependencies
pnpm add @langchain/core @langchain/langgraph @langchain/langgraph-checkpoint

# For Hono.js projects
pnpm add hono

Quick setup example

Hono.js setup

Create your project structure:

my-hono-app/
├── src/
│   ├── agent/
│   │   └── graph.ts
│   ├── routes/
│   │   └── auth.ts
│   └── app.ts
├── .env
└── package.json

Install dependencies:

pnpm add @langgraph-js/pure-graph @langchain/core @langchain/langgraph hono

Create your Hono app:

// src/app.ts
import { Hono } from 'hono';
import { cors } from 'hono/cors';
import LangGraphApp, { type LangGraphServerContext } from '@langgraph-js/pure-graph/dist/adapter/hono/index';
import { registerGraph } from './agent/index';

const app = new Hono<{ Variables: LangGraphServerContext }>();

app.use(cors());

// Register your graph
registerGraph('my-graph', graph);

app.route('/api/langgraph', LangGraphApp);

export default app;

Environment configuration

Create a .env file in your project root with your API keys:

SQLITE_DATABASE_URI=./.langgraph_api/langgraph.db

Start your server

bun run --port 8123 src/app.ts
# or use deno
deno serve -A --env-file=.env --unstable-sloppy-imports --unstable-bare-node-builtins --port 8123 ./agent/raw-server.ts

Your Hono.js server with LangGraph integration is now running!

Test with Studio

Use for interactive testing and debugging:

npx @langgraph-js/ui

Edit page

Architecture Project Structure