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Nyaya — AI-Powered Legal Platform for Indian Law

Nyaya is a full-stack, AI-powered legal platform designed for Indian law. It utilizes Retrieval-Augmented Generation (RAG) to provide citizens, lawyers, and judges with legal query responses grounded in real Indian Acts.

⚡ Quick Pitch

"Nyaya uses a FastAPI RAG microservice backed by PostgreSQL full-text search and pgvector semantic search, reranks legal chunks using Cohere, and generates precise, confidence-scored legal answers via Groq Cloud (groq/compound & qwen/qwen3.6-27b). It features full JWT-based role authentication, a verified lawyer marketplace, a subscription-based quota system powered by Razorpay, and comprehensive case and firm management."

🏗️ System Architecture

User ──> Next.js (App Router, port 3000) ──> Axios Interceptors ──> Express API (Node/TS, port 3001)
                                                                             │
              ┌──────────────────────────────────────────────────────────────┼──────────────────────────────────┐
              │ Python RAG Microservice (FastAPI, port 8000)                 │ Auth & Database                  │
              │                                                              │                                  │
              │ 1. FastEmbed ONNX all-MiniLM-L6-v2                            │ 1. JWT Authentication            │
              │    384-dim vector embeddings (8,166 chunks embedded)         │ 2. Refresh Token Rotation (DB)   │
              │ 2. Hybrid Search:                                            │ 3. Prisma ORM                    │
              │    pgvector Cosine + Postgres FTS/BM25                       │ 4. Neon serverless PostgreSQL     │
              │    Reciprocal Rank Fusion (RRF)                              │ 5. BullMQ Queue Workers (Redis)  │
              │ 3. Cohere Cross-Encoder Reranking                            │                                  │
              │ 4. Groq Generation (`groq/compound` & `qwen/qwen3.6-27b`)     │                                  │
              │ 5. Document OCR, Classification & Analysis                   │                                  │
              └──────────────────────────────────────────────────────────────┴──────────────────────────────────┘

✨ Key Features

  • Context-Aware Legal RAG: Conversational chat that expands queries using historical context, retrieves relevant clauses across 17 Indian Legal Acts using Postgres full-text search plus pgvector semantic search, reranks using Cohere, and generates responses with confidence scoring.
  • Lawyer Marketplace & Verification: A portal for lawyers to get verified, interact with clients, and manage legal consults.
  • AI Document Analysis: Upload legal documents (PDF/images) for automated OCR, classification, and AI-powered legal analysis with relevant law citations.
  • Legal Document Generation: AI-powered generation of legal documents (FIRs, Legal Notices, Contracts, NDAs, etc.) with automatic RAG-based law citation.
  • Case Intelligence: AI analysis of case details with relevant legal provisions, risk assessment, and strategic recommendations.
  • Advanced Auth & Security:
    • OTP-based registration and password resets (Email & SMS).
    • Silent Refresh Token Rotation with Reuse Detection (revokes all device sessions if reuse is detected).
    • Rate limiting, Helmet, CORS protection, and plan quota limiting.
  • Case & Firm Management: Dynamic portals tracking cases (Hearings, Timelines, Parties, Advocates) and law firm teams (Owner, Partner, Associate, Paralegal).
  • Freemium Payments: Multi-tier API rate limiting and plan subscriptions integrated with Razorpay.

🛠️ Tech Stack

Frontend

  • Framework: Next.js 16 (App Router, React 19)
  • Styling: Tailwind CSS v4 & Framer Motion for smooth micro-animations
  • State & Querying: React Context, Axios with interceptors, React Markdown for legal text presentation
  • Icons: Lucide React

Backend (API Gateway)

  • Runtime & Language: Node.js, Express, TypeScript (run via nodemon/ts-node, port 3001)
  • Database & ORM: PostgreSQL (Neon Serverless) with pgvector & Prisma ORM
  • Task Queue: BullMQ & Redis for async emails, SMS OTPs, and background processing
  • Role: Proxies all RAG/AI requests to the Python microservice

Python RAG Microservice

  • Framework: FastAPI with Uvicorn (isolated on port 8000)
  • Embedding Model: FastEmbed ONNX sentence-transformers/all-MiniLM-L6-v2 (384-dim normalized vectors) when RAG_VECTOR_SEARCH=true
  • Vector Database: PostgreSQL pgvector (HNSW cosine index) for full semantic mode
  • Full-Text Search: PostgreSQL tsvector / websearch_to_tsquery, with ILIKE fallback
  • Fusion: Reciprocal Rank Fusion (RRF) combining vector + keyword results in full semantic mode
  • Render Low-Memory Mode: RAG_VECTOR_SEARCH=false skips local model loading and uses Postgres text search + Cohere reranking to stay under 512MB
  • Reranker: Cohere rerank-english-v3.0 cross-encoder
  • LLM Inference: Groq Cloud (groq/compound for RAG response generation & case intelligence; qwen/qwen3.6-27b for fast document classification & translation)
  • Document Processing: pypdf extraction and Groq structured classification/analysis

📁 Repository Structure

Nyaya/
├── backend/                  # Node.js/Express API Gateway (TypeScript, port 3001)
│   ├── prisma/               # Prisma Schema & Migrations
│   ├── src/
│   │   ├── index.ts          # Server bootstrap (port 3001)
│   │   ├── routes/           # Endpoint controllers (auth, chat, search, cases, etc.)
│   │   ├── middleware/       # Auth, role check, rate limiting, plan quota check
│   │   ├── services/         # Token, OTP, RAG retrieval proxy
│   │   └── workers/          # BullMQ document processor, notification workers
│   ├── data/                 # Source legal PDFs (Constitution, BNS, BNSS, BSA, etc.)
│   └── package.json
│
├── rag/                      # Python RAG Microservice (FastAPI, port 8000)
│   ├── main.py               # FastAPI app — all AI/RAG endpoints (port 8000)
│   ├── embeddings.py         # Lazy FastEmbed ONNX embedding engine / mock fallback
│   ├── retrieval.py          # pgvector + FTS retrieval, Render text-search fallback, Cohere reranking
│   ├── document_processor.py # PDF extraction, AI classification & legal analysis
│   ├── generate_embeddings.py# Batch embedding pipeline for LegalChunk table
│   ├── ingest_legal_pdfs.py  # PDF ingestion into Act/Section/Clause tables (17 Legal Acts)
│   ├── check_db.py           # Quick DB health check utility
│   ├── requirements.txt      # Python dependencies
│   └── Dockerfile            # Container definition
│
├── frontend/                 # Next.js App (port 3000)
│   ├── src/
│   │   ├── app/              # Next.js Pages & Layouts (App Router)
│   │   ├── components/       # UI Components
│   │   └── contexts/         # React Contexts (Auth, Theme)
│   └── package.json
│
├── docker-compose.yml        # Docker Multi-Container Compose File
└── README.md                 # Project Documentation (This File)

🧬 RAG Pipeline Walkthrough

  1. Query Expansion: The chat system passes the user query and recent conversation context to construct an expanded, search-friendly query string.
  2. Optional Vector Embedding: When RAG_VECTOR_SEARCH=true, the query is embedded with FastEmbed ONNX all-MiniLM-L6-v2 (384-dim normalized vectors). On 512MB Render services, this is disabled to avoid model memory pressure.
  3. PostgreSQL Retrieval:
    • In full semantic mode, performs a Cosine Distance match on pgvector embeddings (HNSW index).
    • Performs a Text Search (BM25-style) match using Postgres tsvector / websearch_to_tsquery, with ILIKE fallback if no FTS rows match.
    • Merges results using Reciprocal Rank Fusion (RRF): $$\text{RRF Score} = \sum_{m \in M} \frac{1}{60 + \text{rank}_m(d)}$$
  4. Cohere Reranking: Filters candidates down to top 15, then feeds them to Cohere's cross-encoder Rerank API to select the top 8 high-relevance legal chunks.
  5. Generation: Groq (groq/compound) parses the context, structures the answer citing specific sections/articles, assigns a confidence rating (0–100), and returns the response with source citations.

🔌 Python RAG API Endpoints

Endpoint Method Description
/health GET Service health check
/embed POST Generate embeddings for text array
/hybrid-search POST pgvector + FTS retrieval when vector mode is enabled; FTS fallback when disabled
/search POST Full search pipeline (optional embed → retrieve → filter → rerank)
/rerank POST Cohere cross-encoder reranking
/chat-rag POST Full RAG chat (search → rerank → Groq LLM generation)
/case-intelligence POST AI case analysis with legal provisions
/process-document POST PDF OCR, classification & AI legal analysis

⚙️ Environment Configuration

You will need to set up environment variables in the backend and frontend directories.

Backend Config (backend/.env)

Create a .env file in the backend/ directory:

# Database & Redis
DATABASE_URL="postgresql://user:password@host/db?sslmode=require"
REDIS_URL="redis://localhost:6379"

# Token Secret Keys
JWT_ACCESS_SECRET="your-jwt-access-secret"
JWT_REFRESH_SECRET="your-jwt-refresh-secret"

# Python RAG Microservice
PYTHON_RAG_URL="http://127.0.0.1:8000"
RAG_PORT="8000"                    # Explicit port for Python FastAPI
RAG_VECTOR_SEARCH="true"          # Set false on 512MB Render instances
RAG_EMBEDDING_PROVIDER="fastembed" # Set mock/disabled with RAG_VECTOR_SEARCH=false
PYTHON_VERSION="3.11.11"          # Render native Python runtime pin

# LLM & AI Providers
GROQ_API_KEY="gsk_..."
GROQ_MODEL="groq/compound"        # Primary LLM for RAG synthesis & reasoning
GROQ_FAST_MODEL="qwen/qwen3.6-27b" # Fast LLM for classification & translation
COHERE_API_KEY="..."

# Payment Integration
RAZORPAY_KEY_ID="rzp_test_..."
RAZORPAY_KEY_SECRET="..."

# Notifications / Verification (Email / SMS)
SMTP_HOST="smtp.gmail.com"
SMTP_PORT=587
SMTP_USER="your-email@gmail.com"
SMTP_PASS="your-app-password"
TWILIO_ACCOUNT_SID="..."
TWILIO_AUTH_TOKEN="..."
TWILIO_PHONE_NUMBER="..."

# Client URLs
FRONTEND_URL="http://localhost:3000"
PORT=3001

Frontend Config (frontend/.env.local)

Create a .env.local file in the frontend/ directory:

NEXT_PUBLIC_API_URL="http://localhost:3001/api"
NEXT_PUBLIC_GOOGLE_CLIENT_ID="your-google-oauth-client-id"

🚀 Getting Started

There are two main ways to run Nyaya locally.

Option A: Running with Docker Compose (Recommended)

Make sure you have Docker and Docker Compose installed, then spin up the services using:

docker-compose up --build
  • Backend is exposed at: http://localhost:3001
  • Frontend is exposed at: http://localhost:3000
  • Python RAG is exposed at: http://localhost:8000

Option B: Running Manually

1. Start the Backend

cd backend
npm install
npx prisma migrate dev
npx prisma generate
npm run dev

2. Start the Python RAG Microservice

cd rag
pip install -r requirements.txt
python main.py

For Render free/512MB deployments, keep the blueprint values in render.yaml:

PYTHON_VERSION=3.11.11
RAG_VECTOR_SEARCH=false
RAG_EMBEDDING_PROVIDER=mock

This starts the service without importing/loading the local embedding model. Retrieval still works through Postgres full-text search and Cohere reranking. Upgrade the instance memory and switch RAG_VECTOR_SEARCH=true to restore full pgvector semantic retrieval.

3. Ingest Legal Data & Generate Embeddings (First Time Only)

python rag/ingest_legal_pdfs.py  # Ingest 17 legal PDFs into Act/Section/Clause tables
python rag/generate_embeddings.py # Generate 384-dim vector embeddings for all LegalChunks
python rag/check_db.py            # Verify DB chunk counts & embedding coverage

4. Start the Frontend

cd frontend
npm install
npm run dev

Open http://localhost:3000 in your web browser.

📊 Database Entities (Prisma)

  • User profiles: User 1-to-1 with CitizenProfile / LawyerProfile / JudgeProfile / AdminProfile.
  • Auth metadata: RefreshToken (for device management and tracking) and Otp (supporting Aadhaar verification, logins, email verification, etc.).
  • Acts & Sections: Act ──> Section ──> Clause ──> LegalChunk (contains 384-dim vector embeddings and tsvector FTS indexes).
  • Cases & Timeline: Case ──> Hearing / CaseTimeline / CaseParty / CaseAdvocate.
  • Firms: Firm ──> FirmMember (with Owner, Partner, Associate, and Paralegal roles).
  • Documents: UserDocument (uploaded legal documents with AI classification, summary, and analysis reports).
  • Conversations: Conversation ──> Message (chat history with RAG-powered AI responses).

📈 Current Database Stats

  • Legal Acts: 17 Indian Acts (BNSS, BNS, BSA, Constitution, CPC, Contract Act, IBC, POCSO, DPDP, Hindu Marriage Act, Hindu Succession Act, Domestic Violence Act, Limitation Act, Specific Relief Act, Delhi Apartment Act, Repealing & Amending Act, Constitution Preamble)
  • LegalChunks: 8,166 total chunks populated
  • Full-Text Search Coverage: 8,166 / 8,166 (100%)
  • Vector Embedding Coverage: 8,166 / 8,166 (100%) in pgvector (384-dim FastEmbed ONNX all-MiniLM-L6-v2)line/CaseParty/CaseAdvocate`.
  • Firms: Firm ──> FirmMember (with Owner, Partner, Associate, and Paralegal roles).
  • Documents: UserDocument (uploaded legal documents with AI classification, summary, and analysis reports).
  • Conversations: Conversation ──> Message (chat history with RAG-powered AI responses).

📈 Current Database Stats

  • Acts: 2 (Constitution of India, Bharatiya Nyaya Sanhita)
  • Sections: 704 (346 Constitutional Articles + 358 BNS Sections)
  • LegalChunks: 3,917 target chunks after ingestion/embedding generation
  • Embedding Coverage: 100% in full vector mode after npm run rag:embed; not required for Render low-memory text-search mode

About

AI powered Legal Platform

nyaya-km.vercel.app/

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