Guides, Insights & Engineering
Developer-focused articles on privacy, tooling, workflows, and the engineering behind OpenKit.tools.
Why Most Online Dev Tools Are Leaking Your Data (And How to Stop It)
Every time you paste a JWT token or API key into an online tool, where does that data actually go? We break down the hidden risks of server-side dev tools and how client-side processing protects you.
How to Decode and Debug JWT Tokens: A Developer's Guide
Learn how to decode, inspect, and debug JSON Web Tokens. Understand JWT structure, common pitfalls, and how to troubleshoot authentication issues fast.
JSON Formatting for API Development: Beyond Pretty Print
Master JSON formatting, validation, and transformation for API development. Learn minification, path queries, schema validation, and practical workflows.
Regex Patterns Every Developer Needs: A Practical Reference
A practical regex reference with copy-paste patterns for emails, URLs, IPs, dates, passwords, and more. No theory — just patterns that work.
Base64 Encoding Explained: When, Why, and How Developers Use It
Understand when and why to use Base64 encoding. Covers data URIs, email attachments, JWT tokens, API payloads, and common mistakes developers make.
MD5 vs SHA-256 vs SHA-512: When to Use Each Hash Function
A practical guide to choosing hash functions. Learn the differences between MD5, SHA-1, SHA-256, and SHA-512, when each is appropriate, and when they're dangerous.
5 Developer Workflows That Save Hours Every Week
Practical workflows that eliminate repetitive dev tasks. API debugging, data transformation, credential management, code formatting, and deployment prep.