# DevStacked

> DevStacked is a developer-focused site with practical Next.js, React, Supabase,
> and Stripe implementation guides, plus a set of free browser-based developer tools.

Guides are implementation-driven, covering real architecture decisions and production code rather than surface-level tutorials.

## Tools

- [Vercel Cron Expression Generator](https://devstacked.tech/tools/vercel-cron-generator): Generate Vercel-compatible cron expressions with a visual schedule builder, live validation, a plain-English description, and a preview of the next 5 execution times in UTC.
- [JSON-LD Generator](https://devstacked.tech/tools/json-ld-generator): Generate Article, FAQ, Product, LocalBusiness, SoftwareApplication, Breadcrumb, Person, Organization, and Website JSON-LD — checked live against Google's actual Rich Results requirements.
- [Supabase RLS Policy Generator](https://devstacked.tech/tools/rls-policy-generator): Generate separated SELECT/INSERT/UPDATE/DELETE policies for owner-only, team, admin-override, and public-read patterns — with the auth.uid() performance wrapper and required indexes built in.
- [Zod Schema Generator](https://devstacked.tech/tools/zod-schema-generator): Paste a JSON sample or a TypeScript interface and get a production-ready Zod schema with smart field-name inference — plus React Hook Form, API Route, and Server Action output.
- [Meta Tag Generator](https://devstacked.tech/tools/meta-tag-generator): Generate SEO meta tags, Open Graph tags, Twitter Cards, canonical URLs, robots directives, and JSON-LD structured data instantly.

## Guides

### Authentication
- [What Is Authentication? A Beginner's Guide (2026)](https://devstacked.tech/blog/what-is-authentication): What is authentication? Learn how it works, the difference from authorization, common methods (sessions, JWT, OAuth/OIDC, passkeys), and how to implement it in Next.js.
- [Auth.js vs Better Auth in 2026: Which Should You Use?](https://devstacked.tech/blog/authjs-vs-better-auth): Compare Auth.js vs Better Auth for Next.js in 2026 - setup, features, passkeys, organizations, and migration tips to help you pick the right auth library.
- [Session vs JWT: Which Should You Use in Next.js 16?](https://devstacked.tech/blog/session-vs-jwt-for-nextjs-16): Session vs JWT in Next.js 16 compared: how each works, real code with jose, Server Actions, and proxy.ts, and how to pick the right one for your app.
- [Supabase Auth vs Firebase Auth in 2026](https://devstacked.tech/blog/supabase-auth-vs-firebase-auth): Supabase Auth vs Firebase Auth compared for 2026 — setup, pricing, Next.js App Router integration, security, and which one fits your project.
- [Role-Based Access Control (RBAC) in Next.js 16 (2026 Beginner's Guide)](https://devstacked.tech/blog/role-based-authentication-nextjs-16): Learn how to implement role-based authorization (RBAC) in Next.js 16 App Router with TypeScript, Auth.js v5, Proxy, Server Actions, Route Handlers, and permissions.

### Payments
- [Stripe Refunds & Disputes in Next.js 16 (2026)](https://devstacked.tech/blog/stripe-refunds-disputes-nextjs): Learn to handle Stripe refunds and disputes in Next.js 16 - Server Actions, webhook events, evidence submission, and idempotent code you can trust today.
- [Stripe Webhook Idempotency Guide for Next.js 16](https://devstacked.tech/blog/stripe-webhooks-idempotency): Handle Stripe webhook idempotency and retries in Next.js 16 — signature verification, idempotency keys, and duplicate-event prevention.
- [Usage-Based Billing with Stripe (2026 Guide)](https://devstacked.tech/blog/usage-based-billing-with-stripe-nextjs): Learn how to build usage-based billing with Stripe Meters API in Next.js 16. Track API calls, tokens, or storage and bill customers for actual usage.
- [10 Best Stripe Alternatives in 2026 (Compared)](https://devstacked.tech/blog/stripe-vs-payment-processor-alternatives): Comparing Stripe against 10 alternatives — PayPal, Square, Braintree, Adyen, Paddle, and more — on fees, developer experience, and best use case for 2026.
- [Stripe Subscriptions Guide for Next.js 16 (2026)](https://devstacked.tech/blog/stripe-subscription-billing-nextjs-16): Stripe subscription billing tutorial for Next.js 16 — Checkout Sessions using Server Actions, webhooks, Customer Portal. Full working code, not just API docs.

### Backend
- [S3 vs Supabase Storage vs Cloudinary (2026 Guide)](https://devstacked.tech/blog/s3-vs-supabase-storage-vs-cloudinary): Compare S3, Supabase Storage, and Cloudinary for Next.js apps — pricing, setup, image optimization, and which one to pick for your project in 2026.
- [Zod vs Yup in 2026: Which Validation Library Should You Use?](https://devstacked.tech/blog/zod-vs-yup): Zod vs Yup compared for 2026 — TypeScript inference, bundle size, React Hook Form integration, async validation, and real Next.js code examples.
- [How to Display Images from S3 in Next.js 16 (2026 Guide)](https://devstacked.tech/blog/s3-display-images-nextjs-16-guide): Learn 3 ways to display S3-uploaded images in Next.js 16: public URLs, presigned GET links for private files, and CloudFront CDN delivery.
- [Next.js 16 AWS S3 File Upload Guide: Presigned URLs, Proxy & Multipart](https://devstacked.tech/blog/s3-file-uploads-nextjs-16): Learn AWS S3 file uploads in Next.js 16 using server proxy, presigned URLs, and multipart uploads with TypeScript, AWS SDK v3, and production best practices.
- [Integrate Sanity CMS with Next.js 16 App Router](https://devstacked.tech/blog/sanity-nextjs-16-guide): Integrate Sanity CMS with the Next.js 16 App Router. A complete 2026 guide covering embedded Sanity Studio, GROQ queries, SanityLive, Portable Text, & async params.

### Next.js Fundamentals
- [Next.js Cache Components Migration Guide (2026)](https://devstacked.tech/blog/nextjs-cache-components-migration-guide): Migrate to Next.js Cache Components — enable cacheComponents, replace revalidate/fetchCache with use cache and cacheLife, and fix Suspense errors.
- [Server vs Client Components in Next.js 16 (2026 Guide)](https://devstacked.tech/blog/server-vs-client-components-nextjs-16): Learn when to use Server Components vs Client Components in Next.js 16 App Router, with real code examples, common mistakes, and a clear decision framework.
- [Error Handling in Next.js 16: The Complete 2026 Guide](https://devstacked.tech/blog/error-handling-in-nextjs-16): Learn error handling in Next.js 16 with error.tsx, global-error.tsx, not-found.tsx, Server Actions, and Route Handlers — with production-ready code.
- [Route Handlers Explained in Next.js 16](https://devstacked.tech/blog/nextjs-16-route-handlers): Learn Route Handlers in Next.js 16 App Router — the route.ts file convention, HTTP methods, dynamic params, caching with Cache Components, and building a real API.
- [Image Optimization in Next.js 16: Beginner's Guide](https://devstacked.tech/blog/image-optimization-nextjs-16): Learn image optimization in Next.js 16 with next/image — remotePatterns, qualities, preload, AVIF/WebP, and real code examples for beginners.

### SEO
- [Next.js Adoption Benchmark 2026: The Data](https://devstacked.tech/blog/nextjs-adoption-benchmark): An original 2026 Next.js adoption benchmark built from public npm, GitHub, and developer survey data — covering downloads, App Router use, and sentiment.
- [llms.txt Explained: What It Is, Who Uses It, and How to Add It to Next.js](https://devstacked.tech/blog/llms-txt-explained-nextjs-2026): llms.txt explained for Next.js developers — what it actually is, who really reads it, and a copy-paste guide to adding one to your App Router site in 2026.
- [Google Tag Manager & GA4 Setup for Next.js 16 (2026 Guide)](https://devstacked.tech/blog/gtm-analytics-setup-nextjs): Learn how to set up Google Tag Manager and GA4 in Next.js 16 App Router — GTM container, GA4 property, custom events, and Consent Mode, step by step.
- [Google Search Console Setup for Next.js (2026 Beginner's Guide)](https://devstacked.tech/blog/google-search-console-setup-nextjs): Learn how to set up Google Search Console for a Next.js 16 App Router site — verification, sitemap.ts, robots.ts, and indexing best practices.
- [The Complete Technical SEO Checklist for Next.js Developers (2026 Guide)](https://devstacked.tech/blog/technical-seo-checklist): A beginner-friendly, step-by-step technical SEO checklist for Next.js apps — crawlability, metadata, structured data, Core Web Vitals, and more.

### Architecture
- [Feature Flags in SaaS: A Beginner's Guide with Next.js 16 (2026)](https://devstacked.tech/blog/feature-flags-in-saas): Learn what feature flags are and how to add them to a SaaS app with Next.js 16 — a Supabase-backed setup, the Vercel Flags SDK, percentage rollouts, and best practices.
- [SaaS Starter Architecture with Next.js 2026](https://devstacked.tech/blog/saas-starter-architecture-nextjs): Learn how to architect a production-ready SaaS app with Next.js, TypeScript, Tailwind & React Compiler. Folder structure, auth, billing & more.

### DevOps
- [Best Hosting Platforms for Next.js in 2026: Who Actually Handles ISR & PPR Correctly?](https://devstacked.tech/blog/best-nextjs-hosting-platforms): A feature-level comparison of Next.js hosting platforms in 2026 — Vercel, Netlify, Cloudflare, AWS Amplify, Railway, Render, and self-hosting — focused on real ISR and PPR/Cache Components support, not marketing claims.

### Content
- [next-mdx-remote-client Guide for Next.js 16 (2026)](https://devstacked.tech/blog/next-mdx-remote-client-nextjs-16-guide): Learn how to build an MDX blog in Next.js 16 App Router using next-mdx-remote-client — the maintained alternative to the archived next-mdx-remote package.
- [MDX Blog Setup with next-mdx-remote in Next.js 16](https://devstacked.tech/blog/mdx-remote-nextjs-16-guide): Learn how to set up next-mdx-remote in Next.js 16 App Router to render MDX blog posts from the file system, with remark-gfm, custom components, and syntax highlighting.

### Email
- [How to Send Newsletters & Bulk Emails with Resend in Next.js 16](https://devstacked.tech/blog/bulk-emails-resend-nextjs-16-guide): Learn how to send bulk emails with Resend in Next.js 16 using Segments, Topics, Broadcasts, and the Batch API — without hitting rate limits or serverless timeouts.
- [Resend Email Setup Beginner Guide for Next.js 16](https://devstacked.tech/blog/resend-nextjs-16-guide): Resend + Next.js 16 tutorial — contact forms, Server Actions, React Email, domain verification, Vercel deploy. Full working code, not just docs.

## Optional

- [Full sitemap](https://devstacked.tech/sitemap.xml): Every indexable page on the site