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Guides & tutorials

Short, practical explainers for the tools on this site — written for developers who want to understand the concept, not just click the button.

• What Is JSON and How to Format It — JSON is the standard way apps exchange data on the web. Learn what JSON is, how its syntax works, and how to format, validate and minify it. (6 min read)
• How to Generate a Strong Password — A strong password is long, random and unique. Learn what makes passwords crackable, how to generate secure ones, and how to manage them safely. (6 min read)
• Base64 Encoding Explained — Base64 turns binary data into plain text so it can travel safely through email, JSON and URLs. Learn how it works, when to use it, and its limits. (5 min read)
• What Is a UUID and When to Use It — UUIDs are 128-bit unique identifiers used in databases, APIs and distributed systems. Learn the UUID versions, their format, and when to use them. (5 min read)
• Regular Expressions for Beginners — Regular expressions let you search, validate and transform text with patterns. A gentle introduction with practical examples for email, dates and more. (7 min read)
• JWT Tokens Explained — JSON Web Tokens carry identity and claims between services in three Base64 parts. Learn their structure, how verification works, and the security rules. (6 min read)
• Cron Expressions Explained — Cron expressions schedule recurring jobs with five fields for minute, hour, day, month and weekday. Learn the syntax, shortcuts and common mistakes. (5 min read)
• Hashing Explained: MD5 vs SHA-256 — A hash turns any input into a fixed-length fingerprint. Learn how hashing works, why MD5 is broken, and when to use SHA-256 or bcrypt instead. (6 min read)
• What Is a Webhook and How to Test One — Webhooks let apps notify each other in real time when something happens. Learn how webhooks work, what a payload looks like, and how to test and debug them. (6 min read)
• YAML vs JSON: When to Use Which — JSON and YAML both store structured data, but they serve different jobs. Compare their syntax, strengths and pitfalls, and learn when to choose each one. (6 min read)
• URL Encoding Explained — URLs can only contain a limited set of characters, so everything else must be percent-encoded. Learn how URL encoding works, which characters to encode, and the common mistakes. (5 min read)
• What Is a Checksum and How to Verify a Download — A checksum is a short fingerprint that proves a file arrived intact. Learn how checksums work, the difference between MD5, SHA-1 and SHA-256, and how to verify a download. (6 min read)
• Markdown Basics: A Beginner's Guide — Markdown lets you write formatted text with plain characters — headings, lists, links and code without HTML. Learn the core syntax and where Markdown shines. (6 min read)
• API Authentication Explained: API Keys, OAuth and Bearer Tokens — APIs need to know who is calling. Learn how API keys, Basic Auth, Bearer tokens and OAuth work, when to use each, and the security rules that matter. (7 min read)
• Encryption vs Hashing vs Encoding: What's the Difference? — Encryption, hashing and encoding all transform data, but they solve different problems. Learn how each works, when to use it, and the mistakes that confuse them. (6 min read)
• Hex, RGB and HSL Color Explained — Colors on the web are written as hex codes, RGB values or HSL values — three notations for the same color. Learn how each works and how to convert between them. (5 min read)
• SQL Basics for Beginners — SQL is the language of databases: SELECT, WHERE, JOIN and GROUP BY cover most of what you will ever need. A beginner-friendly introduction with examples. (7 min read)
• How to Compare Text Files (Diff) — Diff tools show exactly what changed between two files, line by line. Learn how diffs work, how to read them, and how to use them for code, configs and documents. (5 min read)