Guides & Tutorials
Deep-dive guides on developer tools, encoding, networking, and more — each linking back to free, instant browser tools.
How to Decode Base64 — Complete Guide
Learn what Base64 encoding is, when it is used, and how to decode any Base64 string instantly using free browser tools.
Read guide →The Complete Guide to JSON Formatting & Validation
Master JSON formatting for developers — syntax rules, common errors, prettifying minified output, and validation best practices.
Read guide →UUID vs ULID — Which Unique ID Should You Use?
Compare UUID v4 and ULID for database primary keys. Learn the tradeoffs of random vs sortable identifiers for modern applications.
Read guide →Regular Expressions Cheat Sheet & Guide for Developers
Master regular expressions with this practical cheat sheet covering common patterns, flags, groups, and real-world examples for JavaScript, Python, and more.
Read guide →JSON Web Tokens (JWT) — Security, Structure & Debugging Guide
Learn how JWTs work, the difference between JWS and JWE, how to debug tokens securely, and best practices for JWT authentication.
Read guide →CSS Units Explained — When to Use px, rem, and em for Responsive Design
Master the difference between absolute and relative CSS units. Learn why rem is better for accessibility and how to build truly responsive layouts.
Read guide →Docker Run to Docker Compose — How to Migrate Your Containers
Learn how to convert single docker run commands into scalable docker-compose.yml files. Master volumes, networking, and environment variables.
Read guide →