Node.js isn't just "JavaScript on the server." It's a paradigm shift in how we handle I/O. Thirty years in tech taught me to recognize when something genuinely moves the ground beneath your feet.
Jul 08 2026 · 5′ · Experiments · javascript · node.js
Rate limiting is not a dependency you drop into middleware and call it done. It's an abuse policy. Before you copy that snippet, you need to define what asset you're protecting, what abuse you're expecting, and what a false positive actually costs you.
Jul 07 2026 · 10′ · Tutorials · TypeScript · nextjs
Actuator isn't the problem. The problem is enabling it without a clear exposure policy. A pragmatic guide to using it as an operational tool without turning it into unnecessary public attack surface.
Jul 06 2026 · 8′ · Tutorials · devops · backend
Sniffnet is a cross-platform network traffic monitor written in Rust. Real UI, real-time charts, no security PhD required to understand what's actually going on.
Jul 02 2026 · 5′ · Experiments · networking · open source
Rate limiting isn't an npm dependency — it's an abuse policy. Before copying middleware, you need to define what asset you're protecting, what abuse pattern you expect, and what a false positive costs you. A guide with a decision matrix, real gotchas, and observability for Next.js.
Jun 22 2026 · 9′ · Tutorials · TypeScript · nextjs
Adding an npm dependency isn't just installing code — it's taking on its maintenance, its attack surface, and its transitive deps. Here's the checklist I run before adding any package to a serious TypeScript project.
Jun 22 2026 · 9′ · Tutorials · TypeScript · pnpm
The README on juanchi.dev says "portfolio landing". The code says something else: an editorial system with repo ingestion, quality gate, automatic rewriting, and crons on Railway. The technical story the README doesn't tell.
Jun 22 2026 · 6′ · Next.js · TypeScript
Running the OWASP LLM Top 10 as a real audit is a completely different experience than reading it as a checklist. I ran it against my TypeScript agent stack with system prompts, MCP tools, and Cline — and the findings were uncomfortable.
Jun 20 2026 · 9′ · Tutorials · TypeScript · LLM
The Vercel incident wasn't a technical vulnerability — it was a least-privilege failure applied to OAuth. Break down what scope creep is, how to audit it in existing integrations, and what architectural controls prevent a third party from accumulating permissions it doesn't need.
Jun 18 2026 · 11′ · Tutorials · TypeScript · nextjs
Architecture, real systems, product decisions and technical lessons. Everything reviewed with my own judgment before it ships.
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