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The Phone Number Is Not a String: A Global Validator Field Guide
A practical field guide to country context, canonical output, readable formatting, and the failure modes that make phone validation look easier than it is.
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XML to JSON Converter: five dials, eight questions, one conversion
A mental model for the five dials the XML to JSON converter actually exposes — pretty print, attributes, namespaces, single-element arrays, and the implicit mixed-content corner — plus the eight-question check that catches every silent loss of fidelity before you trust the output.
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Rotate Secrets Before They Become Incidents
A practical four-week plan for turning a messy .env file into an owned, staged, and reversible credential lifecycle.
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Basketball Stats Calculator: Three Formulas, One Career, Zero Magic
Box scores lie. eFG%, TS%, and PER redraw the comparison — three formulas, one calculator, and the interpretation work the spreadsheet skips.
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The Half-Life Equation, Five Ways: A Field Guide to Exponential Decay
Same e^(-λt), three different worlds. How one equation drives isotope calibration in nuclear medicine, drug accumulation in pharmacokinetics, and radiocarbon dating in archaeology.
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API Contract Mutation Tester: 5 mutation families, 3 report labels, 0 happy-path blind spots
Paste an OpenAPI 3.x document. The tool mutates every documented operation into semantically risky variants, then reports which mutations your backend actually rejects — and which ones it cheerfully accepts.
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The Compass Doesn’t Point to Your Destination: A Bearing Calculator Field Guide
A bearing is six navigation questions stacked under one number. The bearing calculator answers them all — if you know which six you're asking.
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CSV Malformed Row Surgeon: six deterministic fixes for damaged CSV files
Six repair passes — BOM strip, stray-quote escape, field quoting, line-ending normalization, empty-line drop, mixed-delimiter rewrite — with a per-row red/green diff as the audit trail.
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Cron Expression Visualizer: 5 fields, 2 dialects, 1 timeline that tells the truth
Before you ship that cron job to prod, paste the expression into a visualizer and check the next 10 runs land where you expect. Standard vs Quartz, timezone drift, and field-by-field parsing.
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Glass, But the Browser Doesn’t Speak It: The Six-Layer Backdrop-Filter Stack That Survives Safari
Backdrop-filter is not one property; it is a six-knob convolution pipeline. Here is the mental model, the alpha pair, and the @supports fallback that keeps the card working on Safari and Firefox 102.