https://www.devkult.com/blog Practical developer notes from Devkult. en https://www.devkult.com/blog/cron-expressions-explained https://www.devkult.com/blog/cron-expressions-explained Sun, 14 Jun 2026 00:00:00 GMT A cron expression is five fields that describe a schedule. Here's what each field means, how the special characters work, and the one gotcha that trips everyone up. https://www.devkult.com/blog/px-rem-em-css-units https://www.devkult.com/blog/px-rem-em-css-units Sat, 13 Jun 2026 00:00:00 GMT px is absolute, rem is relative to the root, em is relative to the element. Here's a practical guide to choosing the right CSS unit — and avoiding em's compounding trap. https://www.devkult.com/blog/how-jwt-signing-works https://www.devkult.com/blog/how-jwt-signing-works Fri, 12 Jun 2026 00:00:00 GMT A JWT's signature is what makes it trustworthy. Here's how HS256 and RS256 signing actually work, and why verifying a token client-side is impossible. https://www.devkult.com/blog/base64-vs-base64url https://www.devkult.com/blog/base64-vs-base64url Wed, 10 Jun 2026 00:00:00 GMT Base64 and Base64URL encode the same bytes but use different alphabets. Here's why JWTs and URLs use the URL-safe variant, and how to convert between them.