Practical guides for the web technologies you work with every day. JSON, JWTs, Base64, regex, hashing — explained with real examples, not just definitions. Every article pairs with a free Devryo tool so you can test ideas directly in your browser.
A clear, practical introduction to JSON. Learn the syntax, data types, real-world use cases in REST APIs and config files, and common pitfalls like missing commas and unsupported comments.
A practical breakdown of JWT structure — header, payload, signature. Covers the full auth flow, how signature verification works, where to store tokens, and JWT vs session cookies.
Learn what a UUID is and when to use each version. Covers v1 (time-based), v4 (random), and v7 (sortable), with practical guidance on database primary keys vs auto-increment IDs.
Understand percent-encoding from scratch. Learn which characters need encoding, the difference between encodeURI and encodeURIComponent, and how to handle encoded URLs in fetch and form submissions.
A clear explanation of cryptographic hashing. Covers MD5, SHA-1, SHA-256 and SHA-512 compared, why passwords are hashed not encrypted, and what hash collisions mean in practice.
Learn how minification reduces file size by removing whitespace, comments, and redundant code. Includes before/after examples, minification vs gzip, and how to integrate it into your build process.
A practical introduction to regex with real examples. Learn the most useful metacharacters, then apply them to email validation, phone numbers, URLs, and dates — with patterns you can copy straight away.
Understand Unix timestamps from first principles. Learn what epoch time is, how to convert between timestamps and human-readable dates in JavaScript, Python, and PHP, and what the Year 2038 problem means.
A beginner-friendly guide to Base64 encoding. Learn how it works, common use cases like embedding images in HTML, sending binary data in APIs, and how to decode Base64 strings.
Start with JSON and Base64 — they show up everywhere in APIs and auth flows. Both guides include interactive Devryo tools so you can try examples immediately.