Blog
Short, practical guides on the problems our tools solve. Each one links to the tool that does the job.
What is CORS and how to fix CORS errors
CORS errors explained in plain terms, why the browser blocks the response, what preflight requests are, and how to fix the server, not the client.
Cron syntax explained with 30 real-world examples
Cron syntax explained field by field, with 30 copy-ready cron examples for every minute, hourly, daily, weekdays, monthly and the gotchas that break schedules.
JWT explained: structure, signing and security mistakes
What a JSON Web Token is, how its three parts and signature work, HS256 vs RS256, and the JWT security mistakes that lead to real vulnerabilities.
Markdown cheat sheet: GitHub Flavored Markdown with examples
A complete Markdown cheat sheet with copyable examples: headings, emphasis, lists, links, images, code, tables, task lists and GitHub Flavored Markdown extras.
Unix timestamps explained: seconds, milliseconds and 2038
What a Unix timestamp is, how to tell seconds from milliseconds, how to convert epoch time in JavaScript, Python and SQL, and what the 2038 problem means.
WebP vs AVIF vs JPEG vs PNG: which image format to use
WebP vs AVIF vs JPEG vs PNG compared: compression, transparency, browser support and encoding speed, with a simple rule for choosing the best image format.
What is Base64 encoding and when should you use it
What Base64 encoding is, how it turns bytes into text, why it adds 33 percent, and when to use it or avoid it, with examples in JavaScript and Python.
How to validate JSON and fix the five most common errors
A practical guide to checking JSON syntax, reading parser error messages and fixing trailing commas, single quotes, unquoted keys, comments and invalid values.