Developer Guides

Practical guides for common developer debugging tasks. Each guide explains the workflow and links to the matching browser-based DevUtils tool.

Guides

🧪 How to Test JavaScript Regex Patterns Check flags, capture groups, match indexes and safe execution before shipping code. 🔐 How Base64 Works in Basic Auth Encode credentials correctly and understand why Base64 is not encryption. 📡 How to Debug HTTP Headers, CORS and Cache Parse headers and inspect the fields that explain API and browser behavior.