Developer guides

4 practical guides on developer topics. Each one ends with a free tool that runs entirely in your browser.

• What a Cron Expression Actually Means (With Examples)

  Five fields, a few special characters, and endless confusion. A plain-English guide to reading and writing cron expressions, with common schedules and the gotchas that cause missed jobs.

  3 min read · Cron Expression Parser

• HTTP Status Codes Cheatsheet: What 200, 301, 404, 500 and the Rest Mean

  A practical guide to the HTTP status codes you'll meet: the five classes, the most common codes, how 401 differs from 403, and which redirects to use.

  2 min read · HTTP Status Code Lookup

• UUID Versions Explained: v1, v4, v5, v7 and Which One to Use

  What a UUID is, how the versions differ, whether collisions are a real risk, and why time-ordered UUIDv7 is friendlier to databases than random v4.

  2 min read · UUID Generator

• How to Write a .gitignore File: Patterns, Examples, and Common Mistakes

  Learn .gitignore pattern syntax, what belongs in it, how to stop tracking files you already committed, and how to keep secrets out of your repository.

  2 min read · .gitignore Generator

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