ThinkFolio

AI-Powered Document Intelligence

Reading that talks back. Think faster. Struggle less.

Upload any document and chat with it—tax forms, insurance policies, contracts, terms & conditions, research papers, manuals. Get instant answers with page citations.

Features

Document Intelligence

• Multi-Format Support: PDF, DOCX, TXT, RTF, PPTX, CSV, EPUB, HTML (up to 50MB)
• AI Chat: Natural conversations with your documents using GPT-4
• Precise Citations: Every answer includes exact page references
• Smart Chunking: Documents intelligently split for accurate retrieval

Organization

• Collections: Organize documents by topic, project, or category
• Favorites: Quick access to your most important files
• Bookmarks: Mark important sections and pages
• Reading List: Queue documents for later review
• Recent Reads: Pick up where you left off

Reading Experience

• PDF Reader: Clean, simplistic reader with AI chat side panel
• Chat Sessions: Save and revisit AI conversations
• Document Library: Unlimited documents, all searchable

Tech Stack

Frontend

• Next.js 15 (App Router)
• React 19
• TypeScript
• Tailwind CSS
• Lucide React (Icons)

Backend

• Next.js API Routes
• Supabase (Database & Auth)
• OpenAI GPT-4 (AI Chat)
• LangChain.js (AI Framework)
• pgvector (Vector Embeddings)

Infrastructure

• Vercel (Deployment)
• Supabase (Backend Services)
• Edge Runtime (API Routes)

Project Structure

├── app/                    # Next.js app directory
│   ├── api/               # API routes
│   │   ├── auth/          # Authentication endpoints
│   │   ├── chat/          # Chat and session management
│   │   ├── papers/        # Document upload and management
│   │   ├── health/        # Health check endpoint
│   │   └── metrics/       # Application metrics
│   ├── auth/              # Authentication pages
│   ├── chat/              # Chat interface pages
│   ├── papers/            # Document management pages
│   └── profile/           # User profile pages
├── frontend/              # Frontend components
│   └── components/        # Reusable UI components
├── lib/                   # Shared utilities
│   ├── db/               # Database utilities
│   ├── services/         # Business logic services
│   ├── supabase/         # Supabase clients
│   ├── types/            # TypeScript definitions
│   ├── utils/            # Helper utilities
│   └── validation/       # Input validation schemas
├── supabase/             # Database migrations
└── public/               # Static assets

Setup

Prerequisites

• Node.js 18+
• npm or yarn
• Supabase account
• OpenAI API key

1. Clone and Install

git clone <repository-url>
cd thinkfolio
npm install

2. Environment Configuration

cp .env.example .env.local

Fill in .env.local:

# Supabase (Settings > API in Supabase Dashboard)
NEXT_PUBLIC_SUPABASE_URL=your_supabase_project_url
NEXT_PUBLIC_SUPABASE_ANON_KEY=your_supabase_anon_key
SUPABASE_SERVICE_ROLE_KEY=your_supabase_service_role_key

# OpenAI (https://platform.openai.com/api-keys)
OPENAI_API_KEY=sk-...

# JWT (Generate: openssl rand -base64 32)
JWT_SECRET=your_jwt_secret_key

NODE_ENV=development

3. Database Setup

1. Create a Supabase project at https://supabase.com/dashboard
2. Enable pgvector extension (Database > Extensions)
3. Run migrations from supabase/migrations/
4. Create papers storage bucket (private)

4. Development

npm run dev
# Open http://localhost:3000

5. Build & Deploy

npm run build
npm run typecheck
npm run lint

API Endpoints

• POST /api/papers/upload - Upload and process documents
• POST /api/chat/sessions/create - Create chat session
• POST /api/chat/message - Send message to AI
• GET /api/chat/sessions - Get user's chat sessions
• GET /api/health - Health check

Security

• Input validation and sanitization
• Rate limiting on API endpoints
• JWT token authentication
• SQL injection prevention
• File type validation
• User authorization checks
• Secure encrypted storage

License

ThinkFolio - AI-Powered Document Intelligence