Developer Guides
Short, practical tutorials with working code for the jobs the tools handle: checking a site, reading a UUID or JWT, converting colours and numbers, and fixing JSON.
- How to Check If a Website Is Down A page that will not load is either the site, your network, or a typo. Work through these checks in order and you will know which one in a couple of minutes.Tool: Website Status Checker
- UUID v4 vs v7: Which One to Use Both are 128-bit identifiers written the same way. The difference is what the bits contain: v4 is almost entirely random, while v7 starts with a timestamp.Tool: UUID Parser
- How to Convert RGB to HEX A HEX colour code is the same three numbers as an RGB colour, written in base 16. Once you see the pattern, you can convert in your head.Tool: RGB to HEX
- Convert JSON to C# Classes: System.Text.Json vs Newtonsoft A generator gives you a working first draft of the classes. The details that bite later are property name matching, number types and nullability.Tool: JSON to C#
- How to Decode a JWT and Read Its Claims A JSON Web Token is three Base64URL strings joined by dots. Reading the first two takes no key, but trusting them does.Tool: JWT Decoder
- Cron Expression Examples and How to Read Them A standard cron expression has five fields. Learn what each one means and you can read any schedule at a glance.Tool: Cron Expression Parser
- How to Convert Decimal to Hexadecimal Hexadecimal is base 16. Divide by 16 repeatedly and read the remainders backwards.Tool: Decimal to HEX
- How to Fix JSON Parse Errors JSON is stricter than JavaScript object syntax. Almost every parse error comes from one of a short list of mistakes.Tool: JSON Validator
