Guides & How-Tos
Quick, friendly guides to help you understand the concepts behind the tools.
JSON Formatting Guide
Learn how to format, beautify, and validate JSON data. Understand JSON syntax, common mistakes, and best practices for developers.
Regular Expressions Guide
Master regular expressions with practical examples, common patterns, and tips for testing regex in JavaScript, Python, and more.
Base64 Encoding Explained
Understand Base64 encoding and decoding — how it works, when to use it, and common pitfalls for web developers.
UUIDs Explained
Learn what UUIDs are, the different versions (v1, v4, v7), and when to use them in databases, APIs, and distributed systems.
URL Encoding Guide
Learn how URL encoding works, why special characters must be percent-encoded, and how to encode/decode URLs correctly.
CSS Box Shadow Guide
Master CSS box-shadow with syntax, examples, layered shadows, and tips for creating depth and elevation in web design.
Color Contrast & Accessibility
Understand WCAG color contrast requirements, accessibility ratios, and how to choose colors that are readable for everyone.
Unix Timestamps Explained
Learn what Unix timestamps are, how they work, and how to convert between timestamps and human-readable dates.
Cron Expressions Guide
Learn cron expression syntax for scheduling tasks. Understand fields, special characters, and common patterns with examples.
Password Security Best Practices
Learn how to create strong passwords, understand entropy, hashing algorithms, and best practices for password security.
JSON Web Tokens Explained
Learn how JWTs work — structure, algorithms, claims, signing, and security best practices for authentication and APIs.
Hashing & Cryptographic Digests
Understand cryptographic hash functions — MD5, SHA-256, HMAC, and when to use each for integrity, passwords, and signatures.
YAML Syntax Guide
Learn YAML syntax — indentation, data types, anchors, and common pitfalls. Practical guide for config files and DevOps.
CSS Layout: Flexbox & Grid
Master CSS Flexbox and Grid layout — when to use each, key properties, and practical patterns for responsive web design.
Markdown Syntax Guide
Complete Markdown syntax reference — headings, links, images, tables, code blocks, and tips for GitHub-flavored Markdown.
CSV Format Guide
Learn the CSV file format — delimiters, quoting rules, encoding, and best practices for data import/export.
DNS & Networking Basics
Understand DNS records, IP addressing, CIDR notation, and subnetting — essential networking concepts for developers.
Character Encoding Guide
Learn about character encoding — ASCII, UTF-8, HTML entities, hex encoding, and Base32 for web developers.
SQL Formatting Guide
Learn SQL formatting best practices — indentation, keyword casing, clause structure, and tips for readable queries.
DevOps Config Files Guide
Learn about Dockerfiles, nginx configs, .gitignore files, and other essential DevOps configuration patterns.
Image Encoding for the Web
Learn about Base64 data URIs, SVG optimization, image formats, and best practices for embedding images in web apps.
Web Security Headers Guide
Understand Content-Security-Policy, CORS, and other security headers — what they do and how to configure them.
Text Processing & Transformation Guide
Learn text manipulation techniques — counting words, changing case, sorting lines, removing duplicates, and more.
Color Theory for Developers
Understand color models (RGB, HSL, OKLCH), palettes, harmony rules, and accessibility — practical color theory for the web.
CSS Animations & Effects Guide
Master CSS animations, transitions, transforms, and visual effects — keyframes, easing, border-radius tricks, and responsive sizing.
HTML & Web Optimization Guide
Learn HTML formatting, minification, meta tags, Open Graph previews, and robots.txt — optimize your site for speed and SEO.
Randomness & Probability Guide
Understand random number generation, cryptographic randomness, probability, dice math, and entropy for developers.
Math & Statistics Guide
Quick reference for percentages, ratios, averages, and common math formulas developers encounter daily.
Binary & Low-Level Encoding Guide
Learn binary, hexadecimal, octal, and ROT13 encoding — how computers represent data at the lowest level.
QR Codes & Data Encoding Guide
Learn how QR codes work, error correction levels, data capacity, and best practices for favicons and visual data encoding.
Typography Scales & Font Pairing
Learn modular type scales, font pairing tips, and how to build a complete typographic hierarchy for the web with CSS and Google Fonts.
SVG & Vector Graphics Guide
Learn SVG basics — elements, paths, viewBox, optimization, accessibility, and decorative patterns for the web.
Design Tokens & CSS Variables Guide
Learn design tokens and CSS custom properties — build scalable themes, dark mode, and design systems with variables.
Data Interchange Formats Guide
Compare JSON, XML, YAML, TOML, and CSV — understand when to use each format, schemas, and conversion between formats.
Web Assets & Favicons Guide
Learn favicon sizes, OG images, placeholder graphics, and image optimization — everything about web assets for developers.
CSS Visual Effects Guide
Master glassmorphism, gradients, filters, patterns, and 3D perspective — modern CSS visual effects for web design.
Prompt Engineering Basics
Master prompt engineering with practical tips, patterns, and anti-patterns for getting better results from AI tools and language models.
Is It Safe to Paste JSON Into an Online Formatter?
Some online JSON formatters upload your data and some do not. Here is the 30-second DevTools check that tells you which one you are using.