📄 RAG File Chat API

A simple RAG-based backend built with Node.js, Express, MongoDB, and OpenAI. Upload files and ask questions from them using AI.

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🚀 Features

• Upload PDF files
• Extract and chunk text
• Generate embeddings (OpenAI)
• Store in MongoDB
• Ask questions using RAG
• Get AI-generated answers

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🛠️ Tech Stack

• Node.js
• Express.js
• MongoDB + Mongoose
• OpenAI API
• Multer
• PDF-Parse

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📁 Project Flow

Upload → Extract Text → Chunk → Embed → Store in DB
Ask Question → Embed Query → Retrieve Chunks → AI Response

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⚙️ Setup

pnpm install
pnpm dev

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🔐 Environment Variables

PORT=8080
MONGO_URI=your_mongodb_uri
OPENROUTER_API_KEY=your_openrouter_api_key

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📡 API

Upload File

POST /api/v1/upload

Ask Question

POST /api/v1/ask

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🧠 Concept

RAG = Retrieval + Generation We retrieve relevant text from documents and pass it to AI for answering.