💬 AI Chatbot – FastAPI + React + LangGraph

A full-stack, session-based AI chatbot with real-time messaging, LLM integration, and persistent conversation history.

Built with FastAPI, React, MongoDB, and LangChain/LangGraph for modular, production-friendly workflows.

Talk to an AI assistant with web search, multi-turn memory, and session management – all in one app.

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✨ Features

• ⚡ Real-time chat with WebSocket-based messaging
• 🧠 LLM integration using LangChain / LangGraph
• 💬 Multi-turn conversation with context-aware responses
• 💾 Persistent sessions stored in MongoDB
• 🗂️ Session management & renaming (chat history per session)
• 🌐 DuckDuckGo web search tool for up-to-date answers
• 🧱 Modular backend workflow using LangGraph nodes and tools
• 🖥️ Modern React frontend with Redux state management

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🧰 Tech Stack

Backend

• FastAPI
• LangChain & LangGraph
• OpenAI / LLM provider (pluggable)
• Motor (MongoDB async client)
• Pydantic for models

Frontend

• React
• Redux (for global state & sessions)
• Axios (HTTP requests)
• WebSocket (real-time messaging)

Database

• MongoDB (session + message history)

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