Major overhaul of about sections across all 30+ tool pages with new structured layout. Added professional feature cards grid immediately after main titles, reorganized content hierarchy with Development Applications and technical comparison sections, implemented Pro Tips sections with best practices, and enhanced visual consistency with gradient backgrounds and hover effects. All sections now use global CSS variables for theme consistency and improved mobile responsiveness.

Added powerful command palette for quick tool navigation. Press Ctrl+K (Windows/Linux) or Cmd+K (Mac) to instantly search through all available tools. Features real-time search across tool names, categories, and descriptions with keyboard navigation support (arrow keys, Enter, Esc).

Added comprehensive YAML to JSON converter tool with real-time conversion, syntax validation, and error handling. Features automatic conversion as you type, copy/clear functionality, and detailed about section explaining YAML vs JSON differences.

Introduced advanced cron expression builder with visual interface and manual input modes. Features intelligent validation with common mistake detection, human-readable explanations, next run time calculation, and library of common expressions. Includes comprehensive about section with cron syntax guide.

Implemented intelligent cron expression validation that detects common mistakes like using '*' for minutes when specific time is intended. Provides helpful warnings and suggestions to prevent scheduling errors.

Comprehensive overhaul of Mock JSON API Generator with syntax highlighting integration. JSON preview now uses ReactJson for interactive, collapsible JSON display with theme-aware color coding. JavaScript usage examples feature SyntaxHighlighter with language-specific highlighting for improved code readability.

Implemented colorized badge system for data types in schema editor. String (green), Number (blue), Boolean (orange), Object (purple), and Array (red) types now have distinct visual indicators with full dark/light theme support and consistent color palette across the application.

Added color-coded HTTP method badges in API preview. GET (blue), POST (green), PUT (orange), DELETE (red) methods now display with semantic colors following RESTful API conventions and maintaining accessibility standards.

Improved workflow with automatic tab switching - Generate API Response button now automatically navigates to Preview tab for immediate result viewing. Streamlined user journey from API configuration to result preview.

Major upgrade to Code Beautifier tool with comprehensive syntax highlighting integration. Added language-specific highlighting for HTML, CSS, and JavaScript in result display. Features dynamic display logic - beautified code shows syntax highlighting with line numbers, while minified code uses optimized textarea with word wrapping for better readability.

Major upgrade to JSON Formatter with ReactJson integration. Added interactive syntax highlighting, collapsible JSON objects/arrays, theme-aware color coding, and improved readability. Output now displays as a rich, interactive JSON viewer instead of plain text.

Complete overhaul of XML Formatter with react-xml-viewer integration. Added color-coded XML tags, attributes, and values with collapsible elements. Features theme-aware styling and interactive tree view for better XML navigation and readability.

Improved tab menu layouts for better mobile experience across multiple tools. Updated UUID Generator, Regex Tester, Base64 Converter, URL Encoder/Decoder, JSON Formatter, Hex/RGB Converter, and Percentage Calculator. Mobile layouts now use 2x2 grid system for 4-tab layouts and maintain full width on small screens while staying compact on desktop.

Added comprehensive percentage calculator tool with 4 calculation modes: What is X% of Y, What percent is X of Y, Percentage change calculation, and Add/Subtract percentage. Features real-time auto-calculation, mobile-optimized responsive design, and detailed mathematical explanations.

Comprehensive icon update for all tool pages to ensure visual consistency. Updated 18+ tool page icons to match sidebar and homepage icons. Each tool now has a unique, meaningful icon that properly represents its functionality. Eliminated duplicate icons and improved visual hierarchy across the entire application.

Synchronized icons across three main locations: sidebar navigation, homepage featured tools, and individual tool pages. This ensures users see the same icon for each tool regardless of where they access it from, improving overall user experience and navigation clarity.

Complete theme system improvements for JWT Decoder tool. Fixed theme inconsistencies across algorithm info cards, warning messages, status badges, and error messages. Enhanced visibility of all badges (algorithm types and token status) and unified error message styling to match application-wide design patterns. All components now properly support both light and dark themes with custom CSS variables.

Added signing algorithm selection dropdown with 13 supported algorithms (HS256, HS384, HS512, RS256, RS384, RS512, ES256, ES384, ES512, PS256, PS384, PS512, none). Includes algorithm information panel with detailed descriptions and compatibility warnings.

Renamed 'Numbers & Encoding' category to 'Numbers & Conversion' for better clarity and organization.

Moved Base Converter tool from 'Data & Format' category to 'Numbers & Conversion' category for better categorization.

Added a new changelog page to track site updates. Detailed information with versions, change types, and dates.

Added different shades of gray to the light theme. Now there's visual distinction between cards, buttons, and other elements.

Added a feedback system that allows users to report bugs, suggest features, and provide general feedback with detailed form.

Advanced theme system added. You can now switch between dark and light themes.

You can add frequently used tools to your favorites and get quick access.

More modern and user-friendly interface design. Responsive design improvements.

New tool added to visualize Git diff files.

Added tool to visualize differences between two texts.

Advanced tool added for viewing CSV files.

Better error handling and performance improvements.

Fixed sidebar and navigation issues on mobile devices.

The first official version of DeveloperToolsKit is released! Improve your developer experience with 25+ tools.

JSON Formatter, UUID Generator, Base64 Converter and more.

Modern interface built with Tailwind CSS and Shadcn UI.