Guides
Short reads that sit next to the tools.
01 · 9 min
JWTs in practice: RFC 7519 without the hand-waving
How JSON Web Tokens are structured, which claims matter, why alg none is dangerous, and how to inspect tokens without leaking them to a hosted debugger.
02 · 9 min
UUID v4 vs v7: Which Should You Use? (2026 Guide)
UUID v4 vs v7 for primary keys in 2026 — randomness, index locality, timestamp leakage, and when NanoID or auto-increment still wins. With a comparison table and code examples.
03 · 8 min
Typing JSON in TypeScript: samples, Zod, and trust boundaries
Why inferred interfaces from sample JSON are a starting point, not a contract, and how Zod (or another parser) belongs at every trust boundary.
04 · 6 min
Why developer tools should run in your browser
The privacy, latency, and AdSense-era content problem of hosted utilities — and how a static, client-side suite avoids uploading secrets.
05 · Documentation
Payment test cards documentation
Stripe, Razorpay, and PayPal sandbox PANs — success and decline cards, 3D Secure, UPI test IDs, test mode setup, and troubleshooting.
06 · Documentation
App Icon Studio documentation
Documentation for designing, previewing, and exporting iOS AppIcon.appiconset packs, Android adaptive icons, PWA assets, promo badges, store marketing frames, and batch variants.
07 · Documentation
QR Code Studio documentation
Documentation for designing, verifying, and exporting QR codes — Wi-Fi, vCard, and UPI payloads, logos and custom shapes, live scan verification with auto-fix, print sizing rules, A4 sticker sheets, and bulk CSV to ZIP.
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