A modern web application starter template built with Next.js 15, featuring authentication, database integration, AI capabilities, and dark mode support.

• Framework: Next.js 15 (App Router)
• Language: TypeScript
• Authentication: Clerk
• Database: Supabase
• Styling: Tailwind CSS v4
• UI Components: shadcn/ui
• AI Integration: Vercel AI SDK
• Theme System: next-themes

Before you begin, ensure you have the following:

• Node.js 18+ installed
• A Clerk account for authentication
• A Supabase account for database
• Optional: OpenAI or Anthropic API key for AI features
• Generated project documents from CodeGuide for best development experience

1. Clone the repository

   git clone <repository-url>
   cd codeguide-starter-kit

2. Install dependencies

   npm install
   # or
   yarn install
   # or
   pnpm install

3. Environment Variables Setup

   • Copy the .env.example file to .env.local:

     cp .env.example .env.local

   • Fill in the environment variables in .env.local (see Configuration section below)

4. Start the development server

   npm run dev
   # or
   yarn dev
   # or
   pnpm dev

5. Open http://localhost:3000 with your browser to see the result.

The homepage includes a setup dashboard with direct links to configure each service.

1. Go to Clerk Dashboard
2. Create a new application
3. Go to API Keys
4. Copy the NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY and CLERK_SECRET_KEY

1. Go to Supabase Dashboard
2. Create a new project
3. Go to Authentication → Integrations → Add Clerk (for third-party auth)
4. Go to Project Settings > API
5. Copy the Project URL as NEXT_PUBLIC_SUPABASE_URL
6. Copy the anon public key as NEXT_PUBLIC_SUPABASE_ANON_KEY

1. Go to OpenAI Platform or Anthropic Console
2. Create an API key
3. Add to your environment variables

Create a .env.local file in the root directory with the following variables:

# Clerk Authentication
NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=your_publishable_key
CLERK_SECRET_KEY=your_secret_key

# Supabase
NEXT_PUBLIC_SUPABASE_URL=your_supabase_url
NEXT_PUBLIC_SUPABASE_ANON_KEY=your_supabase_anon_key

# AI Integration (Optional)
OPENAI_API_KEY=your_openai_api_key
ANTHROPIC_API_KEY=your_anthropic_api_key

• 🔐 Authentication with Clerk (middleware protection)
• 🗄️ Supabase Database with third-party auth integration
• 🤖 AI Chat Interface with OpenAI/Anthropic support
• 🎨 40+ shadcn/ui components (New York style)
• 🌙 Dark mode with system preference detection
• 🎯 Built-in setup dashboard with service status
• 🚀 App Router with Server Components
• 🔒 Row Level Security examples with Clerk user IDs
• 📱 Responsive design with TailwindCSS v4
• 🎨 Custom fonts (Geist Sans, Geist Mono, Parkinsans)

codeguide-starter-kit/
├── src/
│   ├── app/                    # Next.js app router pages
│   │   ├── api/chat/          # AI chat API endpoint
│   │   ├── globals.css        # Global styles with dark mode
│   │   ├── layout.tsx         # Root layout with providers
│   │   └── page.tsx           # Hero + setup dashboard
│   ├── components/            # React components
│   │   ├── ui/                # shadcn/ui components (40+)
│   │   ├── chat.tsx           # AI chat interface
│   │   ├── theme-provider.tsx # Theme context
│   │   └── theme-toggle.tsx   # Dark mode toggle
│   ├── lib/                   # Utility functions
│   │   ├── supabase.ts        # Supabase client with Clerk auth
│   │   ├── user.ts            # User utilities
│   │   ├── utils.ts           # General utilities
│   │   └── env-check.ts       # Environment validation
│   └── middleware.ts          # Clerk route protection
├── supabase/
│   └── migrations/            # Database migrations with RLS examples
├── CLAUDE.md                  # AI coding agent documentation
├── SUPABASE_CLERK_SETUP.md   # Integration setup guide
└── components.json            # shadcn/ui configuration

This starter includes modern Clerk + Supabase integration:

• Third-party auth (not deprecated JWT templates)
• Row Level Security policies using auth.jwt() ->> 'sub' for Clerk user IDs
• Example migrations with various RLS patterns (user-owned, public/private, collaboration)
• Server-side client with automatic Clerk token handling

This starter is optimized for AI coding agents:

• CLAUDE.md - Comprehensive project context and patterns
• Setup guides with detailed integration steps
• Example migrations with RLS policy templates
• Clear file structure and naming conventions
• TypeScript integration with proper type definitions

To implement the generated documentation from CodeGuide:

1. Create a documentation folder in the root directory:

   mkdir documentation

2. Place all generated markdown files from CodeGuide in this directory:

   # Example structure
   documentation/
   ├── project_requirements_document.md             
   ├── app_flow_document.md
   ├── frontend_guideline_document.md
   └── backend_structure_document.md

3. These documentation files will be automatically tracked by git and can be used as a reference for your project's features and implementation details.

Contributions are welcome! Please feel free to submit a Pull Request.