Ledger Room: I built a local invoice sorter, then measured exactly what the privacy costs
This is a submission for the Hacktoberfest Open-Source AI Challenge Week 2: Side Hustle What I Built Ledger turns a folder of invoices and receipts…
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cutting N+1 queries in Next.js API routes with Supabase RPC
when a dashboard starts pulling relational data from Supabase, the naive approach is to fire a separate select per row. the result is a classic N+1…
TuitionSetu: a tutor's Sunday of WhatsApp updates, written by Gemma on her own laptop
This is a submission for the Hacktoberfest Open-Source AI Challenge: Week 2, Side Hustle . What I Built Mita teaches Maths to 30 children from home.…
How do I add x402 payments to an Express / Next.js API?
Quick answer: on Express, wrap routes with paymentMiddleware from @x402/express . On Next.js, use paymentProxy for page routes (or many routes at on…
I scanned 8 popular SaaS starter templates. 7 had launch-blocking patterns hiding in plain sight.
Most AI-built SaaS apps don't start from a blank file. They start from a starter template — clone, rename, add features, ship. So I ran a local laun…
The Math Behind Weighted Grades, in Next.js
I built a free grade calculator with Next.js, and the part that surprised me most was how little of it is framework code. Nearly all of the logic is…
Your rebuild will drop URLs. Google will tell you in six weeks.
A rebuild changes how pages are made. The old addresses stop existing without anyone deciding they should, and Google notices before you do. Here is…
Node.js API Routes and Server Actions: 3 Error Tracking Boundaries (With Attribution)
Instrument three server-side boundaries, but define the cost-attribution record before choosing the error backend. For a customer-support pricing ru…
Claude Opus 5 Built a Full-Stack App From One Prompt: 64/64 Tests and 3 Invented Package Versions
Instead of reading benchmark charts, I gave Claude Opus 5 an empty folder and one prompt: build a full-stack app. I didn't write any of the applicat…
Next.js 15 Support Ends Oct 21: The Upgrade Changes Your Build Won't Catch
TL;DR: Next.js 15 leaves its support window on 21 October 2026. Run the upgrade codemod and the separate next-async-request-api codemod, then test t…
Multi-tenant SaaS with branch-level RBAC in Next.js + Node: a practical architecture
Tenant scoping that fails closed, permissions that know about branches, and the tests that keep both honest. Key takeaways Resolve the tenant from t…
I moved my webhook work into waitUntil() to fix a timeout. The failures didn't go away, they just stopped being visible.
My GitHub App takes a pull request, asks an LLM to review it, and posts the comments back. The first time I ran it end to end against a real reposit…
Architecting Programmatic SEO with Next.js 16: Scaling 500+ High-Performance Routes
Programmatic SEO sounds simple in theory: take a structured dataset, map it to a parameterized URL template, and generate hundreds of targeted landi…
I built an aurora forecast site on Cloudflare Workers and hit every limit they have
Every aurora app answers the wrong question. They show you Kp indexes, solar wind speed, magnetometer plots — great if you're a space-weather nerd.…
How a 24MB Sitemap Crashed Our Vercel Build
Everything was green in CI. Unit tests passed, lint passed, TypeScript compiled cleanly. Then we pushed to production, and 2 minutes into the Vercel…
If AI Can Build Your Charts, Why Learn Recharts?
You can ask an AI coding tool to build a Recharts component for you, give it some sample data and a prompt, and you'll get something that looks like…
Our Next.js ISR writes hit 325K on Vercel's free plan. Determinism fixed half of it
I run promokoduz.uz , a promo-code catalogue for Uzbekistan in three languages. It is a small site: 111 live codes across 75 brands and about 60 vis…
Why @next/bundle-analyzer wasn't enough for our team (So we built an automated PR bot)
If you've ever worked on a growing Next.js app, you've probably lived through this exact scenario: You’re reviewing a seemingly harmless pull reques…
Four product demos on our home page, not one of them a video, and every loop has to be able to cancel itself
Notifio is a desktop app: it sits on your Mac or Windows machine, watches rental search pages, and raises a desktop notification and an email when a…
Two URL spaces, one index page, and a ternary whose branches are identical
There is a ternary in ArticleLayout.tsx that picks between two identical values: const crumbs : Crumb [] = [ { label : " Home " , href : " / " }, ar…
LostNet — The Neighborhood Lost & Found with Gravitational Resonance & Real-World Handovers
This is a submission for the Sanity Challenge, Path Two: Vibe-Code Something Strange What I Built LostNet is a real-time, map-first neighborhood Los…
I built 'Notion meets Microsoft To Do' — E2EE notes, a PWA, and a Play Store app without Kotlin
Notes in one app. Tasks in another. Calendar in a third. Every day I paid a little attention tax shuttling between them. So I built Nuo — a block-ba…
Gemini picks the stretch IDs. TypeScript fills the minutes.
Large language models are great at choosing what belongs in a workout. They are unreliable at how long that workout should last. When we shipped AI…
Your Next.js App Feels Slow, but Lighthouse Says It’s Fast. Why?
You run Lighthouse. Performance: 95. Everything looks great. Then you actually use the application. You click a button. Wait. Open a dashboard. Wait…
Building a Photo-Based Card Grader: Computer Vision Where the LLM Doesn't Pick the Score
Trading-card grading looks like an image-classification problem until you try to build it. A grade is driven by several physical properties at once:…
Building a Private PDF-to-JPG Converter with Next.js and PDF.js
I built Free PDF to JPG Tool to make converting PDF pages into images easier, without requiring registration, installing software or uploading docum…
Tenant Incident Reconstruction with Next.js Server Action API Route Logging
The decisive trade-off is fidelity versus exposure: log enough stable context to reconstruct which tenant cohort saw which experiment behavior, but…
Stop your AI agent from writing N+1 Prisma queries (free Cursor rule + Claude Code skill)
AI coding agents are great at writing Prisma code that works and quietly terrible at writing Prisma code that scales . The most common thing I see i…
OmniJudge Post-Mortem: 1-ULP Drift, Prisma Traps, and Alpine musl
Evaluating hackathons at scale is deceptively difficult. When 40 software projects are evaluated across 4 specialized tracks by 30 volunteer judges…
In Next.js 16, the return value of require.resolve becomes an integer and the code crashes
Summary I added one tool, which AI agents call from outside, to a service I develop at my own company. When this tool is called, one page selected f…