NextLaunch Pro 🚀

Enterprise-Grade Next.js 16 & React 19 Full-Stack SaaS Boilerplate

Built by DevPreFlight — ship monetized SaaS applications in hours with plug-and-play Stripe & Polar Merchant of Record payments, zero-friction session authentication, multi-tenant team workspaces, Prisma ORM, and the full 60+ DevPreFlight Flat UI Component Kit.

⚡ Tech Stack & Highlights

• Framework: Next.js 16 (App Router + Turbopack) & React 19
• Billing & Commerce (Dual-Engine):
  • Stripe (Subscriptions, Customer Portal, Webhook Signature Verification)
  • Polar MoR (Automated Global Tax Compliance, Merchant of Record, Subscriptions)
• Zero-Friction Auth & Sessions:
  • Built-in Prisma Cookie Sessions (Zero 3rd-party setup required)
  • Plug-and-play Supabase SSR helper (OAuth Google/GitHub & Magic Links)
  • Instant 1-Click Demo Login fast-track for rapid previewing
• Database & ORM: Prisma with PostgreSQL, SQLite, MySQL support + Automated Seeder (npm run db:seed)
• Design System: DevPreFlight Flat UI Kit (60+ WCAG AAA accessible components in src/components/preflight-ui/)
• AI-Native: Included SKILL.md, .cursorrules, and CLAUDE.md for AI agent pair programming

📁 Repository Structure

nextlaunch/
├── src/
│   ├── app/
│   │   ├── (auth)/                 # Zero-friction Login, Registration & Demo fast-track
│   │   ├── (marketing)/            # High-converting Landing page & Pricing matrix
│   │   ├── (dashboard)/[workspaceId]/
│   │   │   ├── overview            # SaaS KPI stats, MRR, sparklines
│   │   │   ├── analytics           # Funnel & acquisition channel metrics
│   │   │   ├── team                # Multi-tenant seats, member invitations, RBAC
│   │   │   ├── billing             # Multi-provider subscription portal & invoice history
│   │   │   ├── ai-studio           # Multi-LLM Copilot Studio with token credit metering
│   │   │   ├── ui-showcase         # Interactive live DevPreFlight Flat UI Gallery
│   │   │   └── settings            # Workspace settings & API key management
│   │   ├── actions/                # React Server Actions (auth, billing, impersonation)
│   │   └── api/webhooks/
│   │       ├── stripe/             # Stripe Webhook verification endpoint
│   │       └── polar/              # Polar Webhook verification endpoint
│   ├── components/
│   │   ├── preflight-ui/           # 💎 THE DEVPREFLIGHT FLAT UI KIT (Standalone design system)
│   │   │   ├── primitives/         # Buttons, Inputs, Toggles, Dropdowns, Radios, Tooltips
│   │   │   ├── feedback/           # Modals, Drawers, Alerts, Toasts, Popovers
│   │   │   ├── commerce/           # Pricing Tables, Paywall Gates, Invoicing Receipts
│   │   │   └── README.md           # Standalone UI Kit documentation & porting guide
│   │   ├── dashboard/              # App-specific widgets (Workspace Switcher, Impersonate Banner)
│   │   ├── marketing/              # Landing page sections
│   │   └── layout/                 # Navigation bars & footers
│   ├── services/                   # Decoupled business logic (Auth, Billing, Workspace, AI)
│   └── lib/
│       ├── payments/               # Unified Payment Adapters (Stripe, Polar, Midtrans)
│       ├── supabase/               # Supabase SSR client & server helpers
│       ├── db.ts                   # Prisma singleton client
│       └── auth.ts                 # Session access guards & RBAC helpers
├── prisma/
│   ├── schema.prisma               # Relational schema (User, Workspace, Member, Subscription)
│   └── seed.ts                     # Instant database seeder (Owner, Members, Subscriptions)
└── .agents/skills/                 # AI Agent coding recipes

🚀 Quick Start (In 3 Minutes)

1. Install Dependencies

npm install

2. Configure Environment Variables

Copy .env.example to .env.local:

cp .env.example .env.local

3. Initialize & Seed Database

npx prisma generate
npx prisma db push
npm run db:seed

4. Start Development Server

npm run dev

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

💳 Local Webhook Testing

Testing Stripe Webhooks Locally:

1. Install Stripe CLI.
2. Forward events:

   stripe listen --forward-to localhost:3000/api/webhooks/stripe

3. Copy the signing secret (whsec_...) into .env.local as STRIPE_WEBHOOK_SECRET.

Testing Polar Webhooks Locally:

1. Point your webhook URL to http://localhost:3000/api/webhooks/polar via tunnel or Polar Sandbox.
2. Set POLAR_WEBHOOK_SECRET in .env.local.

📜 License

Commercial License — DevPreFlight. Build unlimited personal and client commercial projects.