Guides

Step-by-step guides for using developer tools effectively.

How to Decode a JWT Token

Learn to inspect JWT tokens, understand their structure, and decode headers, payloads, and signatures step by step.

Format and beautify minified or malformed JSON into clean, readable output with proper indentation.

Create unique identifiers for databases, APIs, and distributed systems using UUID v1, v4, and v7.

Understand MD5, SHA-256, and Bcrypt hashing methods, when to use each, and how to verify password hashes.

Convert CSV data to JSON format step by step, handle edge cases, and learn when to use each format.

Create QR codes from text, URLs, and data with custom styling and error correction levels.

Format and beautify SQL queries with proper indentation, keyword alignment, and consistent styling.

Measure password entropy, understand character pools, and build strong passwords that resist attacks.

Convert Markdown to clean HTML, understand syntax mappings, and preview the output instantly.

Learn color theory fundamentals, build harmonious palettes, and apply them in design systems.

Learn how to encode and decode Base64 strings, understand the encoding algorithm, and use it for data URLs and APIs.

Learn how to generate strong, unique passwords with customizable length, complexity, and entropy requirements.

Learn how to validate email addresses with regex, understand RFC 5322 rules, and test email formats online.

Learn how to convert colors between HEX, RGB, and HSL formats, understand each system, and pick colors visually.

Learn how to compress images for faster page loads, reduce file sizes, and choose the right format for the web.

Learn regular expressions from scratch with patterns, examples, and a live regex tester to validate your patterns.

Learn how to minify HTML, CSS, and JavaScript to reduce file sizes, speed up page loads, and improve performance.

Learn how to format and beautify XML documents with proper indentation, validate structure, and convert to JSON.

Learn how to create professional QR codes for business cards, flyers, and marketing materials with custom styling.

Learn how to write and calculate cron expressions for task scheduling, with examples and a free cron generator tool.

Learn how to compare text side by side, find differences between strings, and use diff tools for code review.

Learn how to test REST API endpoints with curl, browser tools, and online utilities for headers, auth, and request formatting.