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Developer Tools Guides & Tutorials
In-depth articles on JSON, Base64, Regex, JWT, SQL, Markdown, UUID, YAML, QR codes and more. Learn how the tools work and when to use them.
QR Code Generator: How QR Codes Work and How to Create Them
Everything you need to know about QR codes — how they encode data, error correction levels, use cases, and how to generate custom QR codes for free.
HEX, RGB & HSL Color Codes: Complete Color Conversion Guide
Understand the difference between HEX, RGB, and HSL color formats, how to convert between them, and when to use each in CSS and design work.
Diff Checker: How to Compare Text Files and Code Online
Learn how text diffing works, what unified and side-by-side diffs mean, and how to spot changes between two versions of text or code quickly online.
How to Convert JSON to CSV: A Developer's Complete Guide
Step-by-step guide to converting JSON data to CSV format — handling nested objects, arrays, custom delimiters, and exporting for Excel or data analysis.
YAML Explained: Syntax Guide and JSON ↔ YAML Converter
Learn YAML syntax — scalars, sequences, mappings, anchors, and multiline strings. Understand when to use YAML vs JSON and convert between formats instantly.
What is a UUID? Complete Guide to UUID v4 Generation
Understand UUIDs (Universally Unique Identifiers) — what they are, different versions (v1–v5), why UUID v4 is the most popular, and how to generate them instantly.
SQL Formatting Best Practices & Online SQL Formatter
Poorly written SQL is hard to maintain and review. Learn SQL formatting best practices — indentation, keyword casing, line breaks — and format your queries instantly online.
Markdown Syntax Guide: Write Markdown Like a Pro
A complete Markdown syntax reference — headings, lists, links, images, code blocks, tables and more. With a free online Markdown editor and live preview.
MD5 & SHA-256 Hash Generator: How Cryptographic Hashing Works
Understand cryptographic hash functions — what MD5, SHA-1 and SHA-256 are, how they differ, and when to use each. Generate hashes online for free.
JWT Tokens Explained: How to Decode and Inspect JWTs Online
Understand JSON Web Tokens — their structure, how they work, what claims mean, and how to safely decode and inspect JWTs without a library.
Regular Expressions (Regex) Cheat Sheet & Online Tester
A practical regex cheat sheet covering common patterns, flags, character classes, quantifiers, and groups — with an interactive online tester.
How to Create Strong Passwords: Security Best Practices
Learn what makes a password truly strong, why password length matters more than complexity, and how to generate secure passwords instantly.
Base64 Encoding Explained: How to Encode & Decode Online
A clear guide to Base64 encoding — what it is, why it exists, and how to encode or decode text and files online for free.
URL Encoding Guide: What It Is and How to Encode URLs Online
Understand URL encoding (percent-encoding) — why special characters break URLs, which characters must be encoded, and how to encode/decode URLs instantly.
JSON Formatter Online: Format, Validate & Beautify JSON
Learn how to format, validate and minify JSON data instantly online. Understand JSON syntax, common errors, and best practices every developer should know.