// plain English guides for everyday dev concepts
Learn exactly what */15 * * * * means, why it runs 96 times a day, and how to customize the interval for 5, 10, or 30 minutes.
↗The five asterisks in a cron expression each mean something specific. This guide breaks down every field with examples you can use immediately.
↗Step-by-step guide to scheduling a cron job Monday through Friday at a specific time. Includes the exact expression and common variations.
↗Base64 shows up everywhere — JWT tokens, API keys, email attachments. This guide explains exactly what it is, why it exists, and when to use it.
↗JWT tokens are everywhere in modern APIs. Learn how to manually decode one, what each part contains, and how to check if it has expired.
↗Unix timestamps are how computers store time under the hood. This guide explains what they are, why 1970 matters, and how to convert them.
↗Two of the most used JavaScript functions — but easy to confuse. Learn when to use each one, common mistakes, and practical real-world examples.
↗Learn how to fix the most common JSON parsing errors — unexpected token, trailing comma, unquoted keys, and unclosed brackets — with examples of each.
↗Ever seen %20 or %2F in a URL and wondered what it means? This guide explains percent encoding, why it's necessary, and how to encode/decode URLs correctly.
↗Learn how URL query strings work, how to parse them with URLSearchParams, how to build one correctly, and the encoding mistakes that break them.