LangChain demo chat

This app is a demo for a LangChain chat with internet access powered by Brave Search tool and GPT-5-nano.

Tech Stack

• LangChain
• Python
• FastAPI
• Uvicorn
• Brave Search API
• React
• Typescript
• Tailwindcss

Run it

1. Export API keys in environment variables

Im just posting Linux/Mac commands, but you get it:

export BRAVE_SEARCH_API_KEY=<your_api_key>
export OPENAI_API_KEY=<your_api_key> 

2. Run backend

pip3 install fastapi uvicorn langchain langchain-openai langchain-community
uvicorn agent:app --reload

3. Run frontend

npm install
npm run start

4. Enjoy 🚀

You now can chat with the agent through the chat interface.