📧 Email Drafting API

An Express.js-based API that uses LangChain and Groq to generate professional emails from brief summaries.

🚀 Features

• Accepts a summary and returns a professionally drafted email.
• Uses Groq LLM (llama-3.1-8b-instant) via LangChain.
• Clean modular architecture with Express routing and service layers.

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📦 Tech Stack

• Node.js + Express.js – API backend
• LangChain – Prompt & LLM orchestration
• GroqCloud – LLM provider
• dotenv – For environment variables

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📁 Project Structure

project/
│
├── routes/
│ └── email.js # Route to handle /generate-email
│
├── services/
│ └── emailService.js # Uses LangChain + Groq to generate the email
│
├── .env # Environment config (GROQ_API_KEY, PORT)
├── server.js # Main entry point
└── package.json

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🛠️ Setup Instructions

1. Clone the repository

git clone https://github.com/your-username/email-drafting-api.git
cd email-drafting-api

2. Install dependencies

npm install

3. Create a .env file

GROQ_API_KEY=your_groq_api_key
PORT=5000

4. Start the server

node server.js

Server will run at: http://localhost:5000

📬 API Usage

Endpoint

POST /generate-email

Request Body

{
  "summary": "Schedule a meeting with the client next week to discuss project milestones."
}

Response

{
  "email": "Dear [Client],\n\nI hope this message finds you well. I would like to schedule a meeting with you next week to discuss our project milestones..."
}

🔍 Example cURL Request

curl -X POST http://localhost:5000/generate-email \
  -H "Content-Type: application/json" \
  -d '{"summary": "Follow up with HR about the onboarding documents."}'

Video Tutorial

Example Link

📄 License

MIT License — free to use, modify, and share.

✨ Credits

• GroqCloud
• LangChainJS
• Express.js