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‎LICENSE‎

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‎README.md‎

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# LangGraph-MongoDB-Example
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This repository demonstrates how to use LangGraph with MongoDB for building and managing AI agents and conversational applications using an agentic approach. It showcases the integration of language models, graph-based conversation management, and MongoDB for data persistence, enabling the creation of intelligent, autonomous agents in TypeScript and Express.js.
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## Features
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- Utilizes LangGraph for managing agentic conversational flows in TypeScript
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- Integrates with MongoDB Atlas for storing and retrieving conversation data
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- Implements a RESTful API using Express.js for chat interactions
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- Uses OpenAI's GPT model and Anthropic's API for generating responses
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- Includes a tool for employee lookup using MongoDB Atlas vector search
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## Prerequisites
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- [Node.js and npm](https://nodejs.org/)
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- [MongoDB Atlas account](https://www.mongodb.com/cloud/atlas)
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- [OpenAI API key](https://platform.openai.com/account/api-keys)
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- [Anthropic API key](https://www.anthropic.com/claude)
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## Installation
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1. Clone this repository:
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```bash
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git clone https://github.com/mongodb-developer/LangGraph-MongoDB-Example.git
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cd LangGraph-MongoDB-Example
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```
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2. Install the required dependencies:
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```bash
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npm install
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```
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3. Set up your environment variables:
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- Create a `.env` file in the root directory
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- Add your API keys and MongoDB URI:
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```
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OPENAI_API_KEY=your_openai_api_key_here
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ANTHROPIC_API_KEY=your_anthropic_api_key_here
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MONGODB_ATLAS_URI=your_mongodb_atlas_uri_here
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```
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## Seed the Database
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1. Run the seed script to generate and seed the database:
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```bash
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npm run seed
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```
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## Usage
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1. Start the server:
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```bash
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npm run dev
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```
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2. Use the following API endpoints:
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- Start a new conversation:
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```
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curl -X POST -H "Content-Type: application/json" -d '{"message": "Your message here"}' http://localhost:3000/chat
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```
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- Continue an existing conversation:
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```
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curl -X POST -H "Content-Type: application/json" -d '{"message": "Your follow-up message"}' http://localhost:3000/chat/{threadId}
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```
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## Project Structure
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- `index.ts`: Entry point of the application, sets up the Express server and API routes
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- `agent.ts`: Defines the LangGraph agent, tools, and conversation flow
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- `seed-database.ts`: Script for generating and seeding synthetic employee data into MongoDB
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## How it works
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1. The seed script in `seed-database.ts` generates synthetic employee data and populates the MongoDB database.
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2. The LangGraph agent is defined in `agent.ts`, including the conversation graph structure and tools.
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3. MongoDB operations are integrated directly into the agent for storing and retrieving conversation data.
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4. The Express server in `index.ts` provides API endpoints for starting and continuing conversations.
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5. User inputs are processed through the LangGraph agent, generating appropriate responses and updating the conversation state.
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6. Conversation data is persisted in MongoDB Atlas, allowing for continuity across sessions.
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## Contributing
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Contributions are welcome! Please feel free to submit a Pull Request.
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## License
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This project is licensed under the Apache License 2.0 - see the [LICENSE](LICENSE) file for details.

‎index.ts‎

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app.use(express.json());
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// Initialize MongoDB client
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const client = new MongoClient(process.env.MONGODB_ATLAS_URI || "");
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const client = new MongoClient(process.env.MONGODB_ATLAS_URI as string);
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async function startServer() {
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try {

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