How to Use Fake Test Data Safely in Development
Use fake names, addresses and other test data in development without risking real personal data – practical rules and examples.
開発者ガイド
Free Developer Guides – step-by-step tutorials and tips for pdfseotools.com tools.
Test Credit Card Numbers Explained: Luhn Check and Safe Use
How test credit card numbers work, what the Luhn check does and how to use them safely in payment sandboxes – never for real purchases.
How to Format and Validate JSON Online (Step-by-Step Guide)
Format messy JSON into readable code and validate it for errors online. Learn what valid JSON looks like and how to fix syntax problems.
JSON vs XML: Differences, Examples and How to Convert
JSON vs XML compared: syntax, size, readability and typical uses, with side-by-side examples and how to convert one into the other.
Common JSON Errors and How to Fix Them
Trailing commas, single quotes, unescaped characters – the JSON errors developers hit most often and exactly how to fix each one.
What Is a UUID and When Should You Use One?
What a UUID is, how versions 1, 4, 5 and 7 differ, how unique v4 really is and when to use a UUID instead of an auto-increment database ID.