This application facilitates a chatbot by leveraging Next.js as the frontend and FastAPI as the backend, utilizing the power of LangChain for dynamic web interactions.

• Web Interaction via LangChain: Utilizes the latest LangChain version for effective interaction and information extraction from websites.
• Versatile Language Model Integration: Offers compatibility with various models including GPT-4. Users can easily switch between models to suit their needs.
• User-Friendly Next.js Frontend: The interface is intuitive and accessible for users of all technical backgrounds.

The application integrates the Python/FastAPI server into the Next.js app under the /api/ route. This is achieved through next.config.js rewrites, directing any /api/:path* requests to the FastAPI server located in the /api folder. Locally, FastAPI runs on 127.0.0.1:8000, while in production, it operates as serverless functions on Vercel.

1. Install dependencies:

   npm install

2. Create a .env file with your OpenAI API key:

   OPENAI_API_KEY=[your-openai-api-key]
   

3. Start the development server:

   npm run dev

4. Access the application at http://localhost:3000. The FastAPI server runs on http://127.0.0.1:8000.

For backend-only testing:

poetry init 
make run-backend