AI SaaS Starter: Next.js 15 + Supabase + n8n Launch Kit

Stop wasting days wiring up auth and billing. Start shipping your AI product today.

You open your laptop to build your MVP and immediately get stuck fighting Supabase RLS rules, broken Stripe webhooks, and API token leaks. You just want to build your actual product, but instead you're patching boilerplate that every founder has to reinvent. It’s slow, frustrating, and none of it feels like progress.

AI SaaS Starter gives you a complete Next.js 15 + Supabase + n8n launch kit with production-ready auth, billing, multi-tenant data models, secure AI proxying, and two working AI workflows. It replaces 4–10 hours of foundational setup with a single configured project folder you can deploy in minutes.

What’s Included:
- 14 preconfigured Supabase RLS policies for multi-tenant apps
- Session helpers and 8 server‑side auth patterns for safe user handling
- Stripe subscription flow with 3 production webhook handlers
- Secure AI proxy route with token‑safe server isolation
- Optimized Postgres tenant schema with indexed lookups
- Two n8n AI workflows for background processing and async generation
- Vercel + Supabase deployment configs tested on fresh accounts
- A 10‑minute Setup Guide walking you from clone → deploy

Built from real production launches using the same patterns used to ship multiple AI SaaS tools with thousands of users. Every config, workflow, and handler comes from code that has been deployed, tested, and hardened—not from tutorials or unverified snippets.

Who This Is For:
- Solo founders who want to ship an AI MVP this weekend, not next month
- Developers who know Next.js but don’t want to debug RLS rules or Stripe webhooks
- Indie hackers who need a reliable multi‑tenant foundation before touching AI features

Who This Is NOT For:
- Teams building a fully custom backend from scratch
- People looking for a no‑code builder instead of real code

If this doesn’t save you at least 5 hours of setup work, reach out for a full refund.

What's Included (12 files)

• stripe-create-checkout-session.ts
• lib-tenant-usage-tracking.ts
• TROUBLESHOOTING.md
• api-secure-proxy-openai-route.ts
• SETUP-GUIDE.md
• supabase-auth-server-side-hooks.ts
• n8n-workflows-ai-background-job-runner.json
• n8n-workflows-ai-gpt-agent-error-recovery.json
• supabase-rls-multi-tenant-policies.sql
• lib-rate-limiter-postgres.ts
• nextjs-client-helpers-use-supabase-session.ts
• stripe-webhooks-stripe-handle-subscription-events.ts