ViLaw - Legal AI Assistant

A RAG-based legal assistant for Vietnamese legislation analysis.

Overview

ViLaw provides context-aware retrieval and analysis of Vietnamese legal documents using BM25 lexical search combined with LLM-powered responses. The system processes 1,000+ official legal documents with Vietnamese word segmentation for accurate query matching.

Tech Stack

• Backend: Python, FastAPI
• NLP: LangChain, underthesea (Vietnamese tokenizer)
• Search: BM25 (rank_bm25)
• Database: SQLite / PostgreSQL
• LLM: OpenRouter API

Features

• Legal Q&A with contextual retrieval
• Contract risk analysis
• Legal procedure guidance
• Document OCR processing
• Admin dashboard for knowledge base management

Project Structure

vilaw_backend/
├── app/
│   ├── api/v1/          # API endpoints
│   ├── core/            # Configuration
│   ├── db/              # Database models
│   ├── schemas/         # Pydantic schemas
│   └── services/        # Business logic (RAG, OCR, etc.)
├── static/              # Uploaded documents
└── main.py              # Application entry point

Setup

cd vilaw_backend
pip install -r requirements.txt

Create .env file:

DATABASE_URL=sqlite:///./vilaw_db.sqlite3
OPENROUTER_API_KEY=your_api_key
OPENROUTER_MODEL=google/gemini-flash-1.5
OPENROUTER_BASE_URL=https://openrouter.ai/api/v1

Run

python main.py

API available at http://localhost:8000

API Endpoints

Endpoint	Description
POST /api/v1/chat	Legal Q&A
POST /api/v1/contracts/analyze	Contract risk analysis
POST /api/v1/procedures	Procedure guidance
POST /api/v1/db/upload	Upload legal documents

License

MIT