📄 AI Document Chat (RAG-Based Assistant)
An AI-powered document assistant that allows users to upload multiple PDFs and ask questions with accurate, source-backed answers using Retrieval-Augmented Generation (RAG).

🚀 Features
📂 Upload multiple PDF documents
💬 Chat interface with streaming AI responses
🔍 Semantic search using vector embeddings
📄 Page-level source citations for answers
📌 Document-level filtering (query specific files)
⚡ Real-time token streaming (ChatGPT-like UX)
🧠 Handles multi-user queries with proper state isolation

🛠️ Tech Stack
Frontend
Next.js (React)
Tailwind CSS
Streaming UI handling

Backend Node.js + Express
OpenAI API (Embeddings + LLM)
Qdrant (Vector Database)
Multer (File uploads)

🌐 Live Demo
👉 Live App: https://pdf-rag-application.vercel.app/