Next.js SaaS Starter Kit – Supabase Auth, Stripe Billing, API Keys

Production-ready Next.js SaaS Starter Kit for developers who want to launch faster without rebuilding core SaaS infrastructure.

Launchpad is a complete SaaS foundation built with Next.js 15.5.24, TypeScript, Tailwind CSS 4, Supabase, PostgreSQL, Stripe Billing, and Zod.

Key Features

Next.js 15.5.24 App Router + TypeScript

Tailwind CSS 4

Supabase Authentication: Email/Password + Magic Links

Protected user dashboard and accounts

PostgreSQL + Row Level Security (RLS)

Stripe recurring subscriptions, Checkout & Customer Portal

Pro & Team plans

Secure Stripe webhook verification, idempotency & duplicate-event protection

Secure API key generation, SHA-256 hashing, revocation & last-used tracking

Constant-time API-key comparison

Database-backed API rate limiting

Protected API endpoint example

Zod validation & server-side secret protection

Responsive SaaS landing page, pricing, FAQ & production-ready UI states

Supabase database migrations

Production deployment documentation

Built for SaaS Development

Skip rebuilding authentication, subscriptions, billing, API keys, webhooks, database security, and account infrastructure. Start with a structured foundation and focus on building your actual product.

Requirements

Node.js 20+

Supabase project

Stripe account with recurring Products/Prices

What's Included

Complete source code, PostgreSQL/Supabase migrations, .env.example, configuration files, documentation, and a Commercial Single-Project License.

No real API or third-party credentials are included. Connect your own Supabase and Stripe accounts.

License

Use and modify the starter for one independently branded commercial SaaS project. Reselling, sublicensing, or redistributing the starter source itself is prohibited.