·Security
Supabase OAuth, Magic Links, MFA in Next.js [2026]
Secure OAuth, magic links, and MFA in Supabase + Next.js. PKCE flow, redirect URL allowlists, AAL2 step-up, and 5 implementation failure modes.
Security-first guides for building SaaS that ships safe.
Secure OAuth, magic links, and MFA in Supabase + Next.js. PKCE flow, redirect URL allowlists, AAL2 step-up, and 5 implementation failure modes.
Stripe webhook signature failing in Next.js? 5 causes: parsed body, JSON re-stringify, timestamp drift, wrong secret, missing idempotency.
Pre-launch security audit for Next.js + Supabase: 12 highest-impact checks of 30, in audit order, with triage rules. Run weeks before launch.
Supabase JWT lifecycle, ES256 asymmetric signing keys, httpOnly cookie storage, and getClaims vs getUser vs getSession for Next.js apps.
Multi-tenancy and RBAC in Supabase + Next.js. Tenant scoping via JWT claims + RLS, the composite index rule, and five cross-tenant leak modes.
OWASP Top 10:2025 mapped to Next.js + Supabase failure modes plus the architectural defenses that prevent each category. With 2026 CVEs.
CSRF, XSS, and SQL injection prevention in Next.js. Three architectural defenses tied to OWASP A05:2025 and the 2026 Next.js injection CVEs.
You shipped a Lovable, Cursor, or v0 prototype. Now you need a SaaS that won't get hacked. The 4-phase migration playbook for 2026.
Seven security checks every solo dev must verify before going live: auth, RLS, Zod, webhooks, headers, secrets, error handling. The pre-launch audit.
Five architectural patterns most Next.js SaaS templates skip: backend-only access, Zod everywhere, RLS deny-all, signed webhooks, server-only imports.
AI tools like Lovable, Cursor, Bolt, and Replit ship insecure code. The 2026 breach pattern, bug categories, and the architectural fix.
The architectural pattern that prevents Supabase data leaks. Server Actions, admin client, no NEXT_PUBLIC key for queries, ever.
The architectural reasoning behind the SecureStartKit stack. Every layer choice is a security choice, here's why these three, and why no alternatives slot in cleanly.
You can launch in 14 hours without leaving security holes. The playbook with backend-only data access, RLS, and Stripe webhook verification baked in from minute one.
A solo SaaS on Vercel + Supabase + Stripe runs $0 at MVP, ~$50 at first revenue, and under $250 to 10K users. The exact monthly line items.
Most Supabase upload tutorials skip RLS on the bucket and trust the client. Here's how to upload securely in Next.js with Server Actions, signed URLs, and validation.
Vitest for Server Actions and Zod schemas, Playwright for async Server Components and auth flows. The complete Next.js testing setup for SaaS.
Most Supabase RLS tutorials stop at 'enable RLS.' Here's how to write policies for ownership, multi-tenant access, admin roles, and fast queries.
Next.js strips Server Component error details in production. Here's how to wire up error.tsx, global-error.tsx, and Sentry to actually see what broke.
Next.js 16's 'use cache' is easy to misuse. Cache the wrong thing and User A sees User B's data. The three directives explained safely.
An honest comparison of Supabase and Firebase for SaaS developers. Covers database architecture, security, auth, pricing at scale, and developer experience.
Server Actions are public HTTP endpoints anyone can call. Here's how to add rate limiting to login, checkout, and contact forms.
Next.js 16 renamed middleware.ts to proxy.ts. Here's how to migrate your Supabase route protection and understand what actually changed.
A production security checklist for Next.js apps. Covers HTTP headers, CSP, environment variables, Server Actions, RLS, webhook verification, and more.
Claude Code CVEs, Google's $82K API key incident, 5,000+ repos leaking ChatGPT keys. Learn how AI tools expose your secrets and how to lock them down in Next.js.
A security-first guide to SaaS SEO in 2026. Learn how to leverage Next.js rendering, structure high-intent pages, and protect your app from indexing leaks.
Vibe coding tools like Cursor and v0 build apps fast, but they often ship vulnerabilities. Here is the technical audit checklist for Next.js and Supabase apps.
Stop writing HTML strings for emails. Learn how to build type-safe, component-based email workflows in Next.js using Resend and React Email.
Server-side Supabase auth in Next.js App Router. Move beyond outdated client-side patterns with production-ready code.
Server Actions are public HTTP endpoints. Validate every payload with Zod before any database call. Patterns for Next.js 16 and Zod 4 with CVE context.
Production-ready Stripe one-time payments in Next.js 16 with Server Actions, Zod, signed webhooks, idempotency via event ID, and delivery email.
The Lovable hack exposed 170+ apps through missing RLS. Here's what went wrong and the exact steps to secure your Supabase database.
Most SaaS templates expose your database to the browser. Here's why that's dangerous and how SecureStartKit does it differently.
Set up your SecureStartKit SaaS template in under 10 minutes. Clone, configure, and deploy.
Five Next.js SaaS templates compared on security, pricing, and default features. ShipFast, MakerKit, Supastarter, Nextbase, Divjoy in 2026.