Guides
Plain-language explanations of the topics behind the tools, each with worked examples and a link to the tool that does the job.
How to format and validate JSON
What formatting and validating mean, the syntax mistakes that break JSON, and how to find and fix them fast.
What is a JWT and how to decode one
The three parts of a JSON Web Token, what the claims mean, and why anyone can read a token but only the server can trust it.
Compound interest explained, with examples
The compound interest formula, worked examples with real numbers, and what changes when you add regular deposits.
Regex cheat sheet for beginners
The symbols you need most, a few ready-to-use patterns, and the mistakes that trip up beginners.
How a loan EMI is calculated
The EMI formula, a worked example, why early payments are mostly interest, and what an extra payment saves.
What is a UUID, and which version to use
What a UUID is, how the versions differ, and when to pick random, name-based or time-ordered IDs.
YAML vs JSON: what is the difference
The same data in both formats, a side-by-side comparison, the pitfalls of YAML, and how to choose.
How to make a strong password
Why length and randomness matter, how to measure strength in bits, and how many characters or words you really need.