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Hack anything with AI + every security tool ever made
DanLevy.net
Come for the code, stay for the cats.
Latest posts
Don't Fear the Model Router
Route to the best model with confidence.
Into the Breach
Reduce local-dev risk with containers, canaries, and boring limits
Postgres Text Searching Guide 2026
The search tools already in your database, and when each one earns its keep.
Fight Evils with Evals!
Benchmarks measure benchmarks. Your system needs its own measures.
Semantic Vector Search and Other Topics to Win Friends and Lovers
The full search landscape: exact, fuzzy, semantic, hybrid — and when to layer all of them.
It's Time for llm:// Connection Strings
Simplify Model & Provider Config with `llm://` URLs
Your AI Assistant Gave Me Shell Access
How to secure your local or VPS OpenClaw/Moltbot setup
Stop Asking LLMs to Do Math
They are bad at it. Here is how to fix it.
Stop Building Flaky Agents: Use Workflows & Memory
Deterministic patterns for non-deterministic models.
Your AI Agent is Useless Without This
Why MCP is the USB-C of Artificial Intelligence.
Production AI is Terrifying (And How to Fix It)
If your agent doesn't have guardrails, you aren't ready for production.
Don't Marry Your Model
LLM Routing, so hot right now
Foreign Keys: Stop Asking If They're Fast
Ask what you're actually optimizing for.
Stop Leaking Memory with WeakMap
Fixing weak code with weak references!
JSONB: The Best Way to Ruin Your Database
JSONB is powerful, useful, and very easy to misuse when you let a blob become your real schema.
Your Timestamp is a Lie
What a train ticket taught me about storing time in databases
Async Stack Traces: Why `Error.stack` Lies to You
The microtask queue ate my homework (and my debugging context).
Quiz: Advanced JS Error Mastery
Are your exceptions truly exceptional?
2025's Wave of Database Innovation
You can thank AI.
Who put vulns in my patch?
Why updates can't save you
The Last to Think
Human or Machine?
Beware the Single-Purpose People
So pure it hurts
You May Not Need Algolia™
Static sites probably do not need hosted search
Essential Docker Security Tips for Self-Hosting
Secure your self-hosted services, from defense to monitoring!
The Unassuming Power of Multiple-Choice Questions
How to Harness the Full Potential of MCQs in Education
From Zero to Regex Hero
Extract & Parse URL-like Strings with a Single Regex
Quiz: Essential Rust Memory Management
(Borrow) check yo self before you wreck yo self! 🦀
Quiz: AWS Storage: 20+ Questions!
Can you navigate the cloud labyrinth?
Open Source Journal
A collection of open-source projects I've worked on.
Replacing Myself with AI
How I learned to stop worrying and love the GPT.
Quiz: Deep Postgres: Pt. 2
Are you SQL Steele? Or a SQL Softie?
Quiz: Deep Postgres: Pt. 1
Does SQL make you squeal?
Quiz: Bash & Shell Mastery
Can you talk to computers? Like, well?
Quiz: Regular Expressions Mastery
Can you tame some wild RegEx?
Quiz: NodeJS IO Mastery
Test your knowledge of files, streams & buffers
Quiz: Destructuring Delights
Are you a maestro of Destructuring?
Quiz: Prove your SQL Skills!
Are you team SQL? Or noSQL?
Quiz: Do You know CSS fundamentals? (2025)
Are you front-end enough?
Quiz: Do You know Modern CSS? (for 2025)
Are you front-end enough?
Quiz: Can you count on JavaScript?
Know your `parseInt` from `parseFloat`?
Quiz: Does HTML still belong on your résumé?
Prove yourself!
Quiz: Symbols & Enumerables
Do you know the less-famous bits of ES2015?
Quiz: Do You Know Modern JavaScript?
Prove your esteemed JavaScript skillz!
Quiz: Data Structures & Algorithms
Can you BS a Binary Tree?
The Priority Trap
Is Multiple Choice the Best Choice?
One weird trick to speed up feature teams!
Staff engineers hate this!
How to lose a billion dollars super fast
Breaking Unicorns
Understanding International Numbers & Currency
Localized money explained!
Lessons Learned Upgrading My Blog
Astro, Tailwind, MDX, Pagefind, and more!