# 🤖 ChatBot AI with OpenAI (Node.js)

This is a lightweight Node.js-based chatbot API that connects to OpenAI's language models (like `text-davinci-003` or `gpt-4`) to generate AI-powered responses for any input prompt.

## 🚀 Features

- Chat completion using OpenAI's API
- Express.js backend server
- Handles CORS and JSON body parsing
- Secure API key via environment variables
- Clear error handling
- Simple POST endpoint (`/message`)

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## 📦 Installation

1. **Clone the repository**

```bash
git clone https://github.com/your-username/chatbot-openai-node.git
cd chatbot-openai-node

2. Install dependencies

npm install

3. Create a .env file

OPENAI_API_KEY=your_openai_api_key
PORT=3000

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💡 Usage

Start the server:

node index.js

Or with nodemon for development:

npx nodemon index.js

Make a request:

POST /message
Content-Type: application/json

{
  "prompt": "Tell me a fun fact about space"
}

Response:

"Sure! Did you know that one day on Venus is longer than one year on Venus?"

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🔐 Billing Notice

⚠️ IMPORTANT: You must have a valid OpenAI account with billing enabled to use the API. Without this, your requests will be rejected by OpenAI.

Sign up and manage billing here: https://platform.openai.com/account/billing

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🧠 Models Supported

• text-davinci-003 (completion)
• gpt-3.5-turbo / gpt-4 (chat) (you'll need to change the model key if switching)

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📁 Project Structure

├── index.js          # Express server with OpenAI API logic
├── .env              # Your secret API keys
├── package.json      # Node dependencies and scripts

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🔧 Dependencies

• openai
• express
• body-parser
• cors
• dotenv

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📜 License

MIT

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✨ Author

Adeluola Ayomide David — @theStrategist

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