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Guides on the formats and tools developers touch every day, written by the a2zutil.dev team.
What We're Building Next: dont-break-prod
A PR-review training game for payments engineers — read the contract, read the code, decide if it's safe to ship.
5 Habits for Debugging Messy JSON Payloads Faster
The difference between a two-minute payload review and a twenty-minute one usually comes down to a few small habits.
SQL Formatting Conventions That Make Code Review Easier
A query that's easy to review is one where the diff shows the actual change, not a reflow of every line around it.
Testing Webhooks Locally Without Exposing Your Machine
You don't need to punch a hole in your firewall to see what a provider actually sends before your endpoint touches it.
UUID v4 vs Nanoid: Picking the Right ID Format
The right ID format depends less on randomness quality and more on where the ID ends up — a URL, a database index, or a log line.
A Field Guide to Case Conversion: camelCase, snake_case, kebab-case
Every case style exists because some system it talks to enforces it — knowing which is which saves a round trip to Stack Overflow.
Why We Don't Ask for an Account
An account is a cost to us and a cost to you — we'd rather earn the visit back than lock the tool behind a login.