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Notes & Essays

Practical notes on React, Next.js, Vue, product UI, and shipping reliable software across health-tech and logistics.

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Next.js & Security· SEP 2026· 5 min read
Do We Still Need Frontend Tests in 2026? A Real Next.js Case Study
AI ships code faster — and regressions too. A practical Testing Trophy for a Next.js App Router blog: Vitest for lib logic, Playwright for list → detail → 404.
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More writing

05 posts
Next.js & SecurityAI Engineering
7 min read
What I Checked Before Letting Strangers Talk to My AI Chatbot
Before Ask Yeremia on /lab went public, I worried about stolen API keys, runaway bills, and visitors sweet-talking the model past its rules — here is the four-part checklist I actually ran.
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ReactNext.js & Security
4 min read
Why This Site's Intro Replays After You Close the Tab
A home-only overlay, sessionStorage (not localStorage), useSyncExternalStore, and Motion's AnimatePresence — with the hero painted underneath so LCP is not gated on the intro.
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Next.js & Security
5 min read
What PageSpeed Unused JavaScript Actually Means
A 91 mobile score was LCP, not a missing sitemap. How this Next.js portfolio split Motion, labs, and the mobile sheet — and the traps that look like dead code but aren’t.
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Next.js & Security
6 min read
Frontend Security in Next.js and Nuxt
XSS, cookies, CSRF, CORS, CSP, and lockfiles — what React and Vue already escape, where v-html and dangerouslySetInnerHTML still bite, and how that maps onto App Router and Nuxt.
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