⚡ For SaaS developers using Cursor AI

Stop re-explaining your stack to Cursor
on every prompt.

50 battle-tested .cursorrules for building production SaaS with AI. Each rule includes the exact prompt, why it matters, and TypeScript before/after code examples.

Get the Cursor Rules Pack — $27 →

Instant download · One-time payment · Works with Cursor 0.45+

The problem with writing cursor rules from scratch

You know your rules should be specific. "Write clean code" does nothing — Cursor can't act on vague. But writing 50 precise, production-tested rules from scratch takes weeks of trial and error.

And even when you do, they drift. You add a CLAUDE.md. Then a copilot-instructions.md. Now your rules contradict each other and you're managing config instead of shipping.

This pack gives you 50 rules you can drop in today — each one with the TypeScript output difference to prove it works.

What's inside

API Routes

Zod validation on every route

Enforce request body validation before any business logic executes. No more uncaught runtime errors from malformed payloads.

Multi-tenancy

tenantId filter enforcement

Every DB query must include tenant context. If it's missing, throw — never fall back to unfiltered queries. Prevents the most expensive data leaks.

Stripe

Idempotency on all mutations

Webhook handlers and payment mutations require idempotency keys. Prevents double-charges in retry scenarios.

Supabase

RLS-aware query patterns

All Supabase queries must assume RLS is active. Server-side calls use service role only when explicitly justified.

Error handling

Typed error responses

All errors follow { error: { code, message } } shape. No raw strings. No bare try/catch without proper error typing.

Next.js App Router

Server component defaults

Components are server-first. 'use client' requires explicit justification in a comment. Keeps bundle sizes low by default.

// Before — without the Zod validation rule
export async function POST(req: Request) { const body = await req.json() // ← no validation await db.createUser(body.email, body.name) return Response.json({ ok: true }) }
// After — Cursor applies the rule automatically
const CreateUserSchema = z.object({ email: z.string().email(), name: z.string().min(1).max(100), }) export async function POST(req: Request) { const result = CreateUserSchema.safeParse(await req.json()) if (!result.success) { return Response.json({ error: { code: 'VALIDATION_ERROR', message: result.error.message } }, { status: 400 }) } await db.createUser(result.data.email, result.data.name) return Response.json({ data: { ok: true } }) }

What the pack covers

Questions

Does this work with the new .cursor/rules directory format?

Yes. The rules are written as pure intent — the actual constraint, not the file format. You can use them as a single .cursorrules file or split them into individual .mdc files in .cursor/rules/. Both formats are supported and instructions are included.

What if I don't use Supabase or Prisma?

About 30 of the 50 rules are stack-agnostic — error handling, validation, TypeScript discipline, multi-tenancy patterns, component architecture. The ORM/database-specific rules show the pattern clearly enough that adapting them to Drizzle, Mongoose, or a raw SQL layer takes 5 minutes.

Is this a one-time purchase?

Yes. $27, one payment, instant download. No subscription, no "pro tier." You get the PDF + the raw .cursorrules text file ready to copy into your project.

How is this different from free cursor rules on GitHub?

Free repos give you the rule text. This pack gives you: (1) why each rule matters in production, (2) the TypeScript before/after to confirm what actually changes in Cursor's output, (3) 5 advanced multi-tenancy patterns you won't find in public repos. It's the reasoning + proof, not just the config.

50 rules. Drop in today. Ship faster tomorrow.

$27 · Instant download · Works with Cursor 0.45+ and .cursor/rules format

Get the Cursor Rules Pack →