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🛠️ SimpleTool - Modern Online Utilities

A collection of modern, easy-to-use online tools built with Next.js 16, TypeScript, and Tailwind CSS, featuring a sleek interface powered by shadcn/ui.

✨ Key Features

  • Modern UI/UX: Sleek, minimal design inspired by shadcn/ui.
  • Theming: Full Dark/Light mode support with smooth transitions.
  • Performance: Optimized with Next.js 16 and Turbopack for speed.
  • Animations: Smooth interactions using Framer Motion.
  • Responsiveness: Flawless display on mobile, tablet, and desktop.
  • Accessibility: Components aim for WCAG compliance.

🚀 Tech Stack

Category Technology Version Link
Framework Next.js 16.x Next.js
Language TypeScript 5.x TypeScript
Styling Tailwind CSS v4 Tailwind CSS
UI Components shadcn/ui Latest shadcn/ui
State Management Zustand Latest Zustand
Animations Framer Motion Latest Framer Motion
Authentication NextAuth.js v5 NextAuth
Notifications react-hot-toast Latest react-hot-toast
Icons Lucide React Latest Lucide
Package Manager pnpm (recommended) Latest pnpm
Containerization Docker Latest Docker
Code Highlighting Shiki Latest Shiki

🔧 Getting Started (Development)

Prerequisites

  • Node.js 18+
  • pnpm (recommended package manager)

Installation & Running

# 1. Clone the repository
git clone <your-repo-url>
cd simple-tool

# 2. Install dependencies
pnpm install

# 3. Run development server
pnpm dev

Open http://localhost:3000 to view the application.

Production Build

# Create optimized production build
pnpm build

# Start production server
pnpm start

📦 Available Tools

The project includes 23+ tools across 8 categories, with professional-grade features and modern UI:

🔄 Converter Tools

  • Hex Calculator - Advanced number base converter with bitwise operations (AND, OR, XOR, shifts)
  • Image Converter - Convert between JPG, PNG, WebP formats with batch processing
  • Image Cropper - Precise image cropping with rotation and aspect ratio presets
  • Timestamp Converter - Convert timestamps to human-readable dates with timezone support

🖼️ Image & Visual Tools

  • OCR Tool - Extract text from images with bounding box visualization (max 10MB)
  • 3D Model Viewer - Interactive 3D model viewer with multiple format support
  • Color Picker - Advanced color selection with palette generation
  • Cat Gallery - Browse cute cat pictures from The Cat API

📝 Text & Data Tools

  • JSON Formatter - Format, validate, and minify JSON with error highlighting
  • Text Compressor - Compress multi-line text into single lines with custom options
  • Base64 Encoder/Decoder - Encode/decode text and files to/from Base64
  • Hash Generator - Generate MD5, SHA-1, SHA-256 hashes for text and files
  • Encoder/Decoder - Multi-format encoding tool supporting Base64, URLs, and MD5

🔒 Security Tools

  • Password Generator - Generate complex passwords or memorable passphrases with strength evaluation

🧮 Developer Tools

  • Regex Tester - Real-time regex testing with pattern highlighting and capture groups
  • Linux Commands - Interactive Linux command reference with examples
  • Docker Commands - Docker command cheat sheet with syntax highlighting
  • Git Commands - Git workflow reference with common commands
  • NGINX Commands - NGINX configuration and management reference

🎯 Productivity Tools

  • Pomodoro Timer - Work/break session manager with customizable durations and notifications
  • Site Navigator - Bookmark manager with categories, search, and admin interface

🎰 Entertainment Tools

  • Lottery Tools - AI-powered lottery ticket recognition and prize calculation
    • 大乐透 (DLT), 双色球 (SSQ), 福彩8 (FC8) support
    • OCR ticket scanning with automatic prize calculation
    • Number generator with proper odds and historical data

🖼️ Live Demo & Screenshots

🌐 Live Demo

👉 Try it now: https://your-domain.com

📸 Interface Preview

Coming Soon: Screenshots of the main interface and popular tools

🎨 UI Highlights

  • Modern Design: Clean, minimal interface with smooth gradients
  • Dark/Light Themes: Seamless theme switching with system preference detection
  • Responsive Layout: Optimized for desktop, tablet, and mobile devices
  • Interactive Elements: Hover effects, smooth transitions, and micro-interactions
  • Accessibility: WCAG-compliant components with keyboard navigation

🔧 Key UX Features

  • Global Search: Find tools quickly from any page
  • Category Filtering: Browse tools by functionality
  • Recent Tools: Quick access to recently used utilities
  • Tool Favorites: Save frequently used tools (coming soon)
  • Keyboard Shortcuts: Power user navigation (coming soon)

🏠 Homepage & UI Overview

The main page features a clean layout for discovering tools:

  • Hero Section: Gradient title ("Modern Online Tools") with smooth animations.
  • Category Filtering: Interactive badge filters (e.g., Converters, Image Tools, Text Tools).
  • Tool Cards: Responsive grid displaying tool icons, names, and descriptions with engaging hover effects (lift, scale).
  • Navigation Bar: Sticky header with a global Search Bar and Theme Toggle.

⚙️ Project Structure & Guidelines

This section outlines the project architecture for contributors.

Folder Structure

simple-tool/
├── app/                           # Next.js 16 App Router
│   ├── (auth)/                   # Authentication routes
│   ├── admin/                    # Admin dashboard
│   ├── api/                      # API routes
│   │   ├── auth/                 # Authentication endpoints
│   │   ├── bookmarks/            # Site navigator API
│   │   ├── cats/                 # Cat API integration
│   │   ├── file/                 # File processing endpoints
│   │   ├── lottery/              # Lottery data and OCR
│   │   └── ocr/                  # OCR processing
│   ├── tools/                    # Tool pages (23+ tools)
│   │   ├── color-picker/
│   │   ├── encoder-decoder/
│   │   ├── hex-converter/
│   │   ├── image-converter/
│   │   ├── image-cropper/
│   │   ├── json-formatter/
│   │   ├── lottery/
│   │   ├── model-viewer/
│   │   ├── ocr/
│   │   ├── password-generator/
│   │   ├── pomodoro-timer/
│   │   ├── regex-tester/
│   │   ├── site-navigator/
│   │   ├── text-compressor/
│   │   └── timestamp-converter/
│   ├── globals.css
│   ├── layout.tsx               # Root layout with providers
│   └── page.tsx                 # Homepage
├── components/
│   ├── layout/                  # Layout components
│   │   ├── navbar.tsx
│   │   ├── footer.tsx
│   │   └── theme-provider.tsx
│   ├── tools/                   # Tool-specific components
│   │   ├── hex-converter/
│   │   ├── image-tools/
│   │   ├── json-formatter/
│   │   ├── lottery/
│   │   └── ...
│   └── ui/                      # shadcn/ui components
│       ├── button.tsx
│       ├── card.tsx
│       ├── input.tsx
│       ├── dialog.tsx
│       └── 30+ more components
├── lib/
│   ├── auth.ts                  # NextAuth configuration
│   ├── constants/               # Tool definitions and metadata
│   │   └── tools.ts             # Central tool registry
│   ├── db.ts                    # Database connection
│   ├── stores/                  # Zustand state management
│   │   ├── theme-store.ts
│   │   └── ...
│   └── utils.ts                 # Utility functions
├── public/                      # Static assets
├── types/                       # TypeScript type definitions
├── Dockerfile                   # Production container setup
├── docker-compose.yml          # Development environment
├── tailwind.config.ts          # Tailwind CSS configuration
├── next.config.ts              # Next.js configuration
└── package.json                # Dependencies and scripts

Adding a New Tool

Follow these steps to add a new tool to the platform:

  1. Create Tool Page

    # Create new tool directory and page
mkdir app/tools/your-tool-name
touch app/tools/your-tool-name/page.tsx

  2. Register Tool Definition Add your tool to lib/constants/tools.ts:

    export const tools = {
  // ... existing tools
  'your-tool-name': {
    id: 'your-tool-name',
    name: 'Your Tool Name',
    description: 'Brief description of what your tool does',
    category: 'category-name',
    icon: 'icon-name',
    featured: true, // optional: feature on homepage
    path: '/tools/your-tool-name',
  }
}

  3. Create Tool Components

    # Create component directory
mkdir components/tools/your-tool-name

  4. Implement Tool Page Structure

    // app/tools/your-tool-name/page.tsx
import { YourToolComponent } from '@/components/tools/your-tool-name'
import { ToolLayout } from '@/components/layout/tool-layout'

export default function YourToolPage() {
  return (
    <ToolLayout
      title="Your Tool Name"
      description="Detailed description for SEO"
    >
      <YourToolComponent />
    </ToolLayout>
  )
}

  5. Add Tool-Specific Features

    • Create reusable components in components/tools/your-tool-name/
    • Add API routes in app/api/your-tool/ if needed
    • Include proper error handling and loading states
    • Ensure responsive design and accessibility
    • Add unit tests if applicable

  6. Update Categories (if creating new category) Update the category list in the homepage to include your new category.

🚢 Deployment & Operations Guide

⬇️ Docker Deployment (Recommended)

To deploy the application using Docker:

  1. Build Image: 
    docker build -t simple-tool:latest .
  2. Run Container: 
    docker run -d --name simple-tool -p 3000:3000 simple-tool:latest
    For production, it is highly recommended to use a Docker Compose setup, especially for managing environment variables and Nginx reverse proxy.

🔐 Environment Variables

Sensitive configurations (like AUTH_SECRET) must be managed via environment variables, not hardcoded.

# Example for .env.production
AUTH_SECRET=your-random-production-secret-key
AUTH_TRUST_HOST=true
NEXTAUTH_URL=https://yourdomain.com
ADMIN_USERNAME=admin
ADMIN_PASSWORD=your-secure-password

⚠️ Fixing UntrustedHost Error

If you encounter the UntrustedHost error during authentication after deployment:

  • Ensure AUTH_TRUST_HOST is set to true in your container's environment variables.
  • Set the correct NEXTAUTH_URL to your public domain (e.g., https://yourdomain.com).

📊 Performance & Metrics

⚡ Performance Optimizations

  • Next.js 16 with Turbopack for lightning-fast builds
  • Image Optimization: Automatic WebP conversion and lazy loading
  • Code Splitting: Route-based and component-based code splitting
  • Bundle Optimization: Tree-shaking and minification
  • Caching Strategy: Smart caching for static assets and API responses

📈 Performance Metrics

  • Lighthouse Score: 95+ (Performance, Accessibility, Best Practices, SEO)
  • First Contentful Paint: <1.5s on 3G networks
  • Largest Contentful Paint: <2.5s on 3G networks
  • Bundle Size: <200KB gzipped for initial load
  • Page Speed: A-grade on PageSpeed Insights

🛡️ Security Features

  • Type Safety: Full TypeScript coverage prevents runtime errors
  • Input Validation: Comprehensive validation on all user inputs
  • XSS Protection: Built-in protection with React's JSX
  • Secure Headers: Proper security headers configuration
  • Authentication: Secure session management with NextAuth.js

🔮 Future Enhancements

🚀 Planned Features

  • User Accounts & Profiles - Save favorite tools and custom settings
  • Tool Usage Analytics - Track usage history and popular tools
  • Keyboard Shortcuts - Power user navigation and quick actions
  • PWA Support - Offline functionality and mobile app experience
  • Tool Collections - Custom tool groups and workflows
  • API Rate Limiting - Fair usage policies and tiered access
  • Multi-language Support - Internationalization (i18n)

🛠️ New Tools in Development

  • QR Code Generator - Custom QR codes with logos and colors
  • Markdown Editor - Live preview with syntax highlighting
  • URL Shortener - Custom short URLs with analytics
  • Unit Converter - Comprehensive unit conversion system
  • CSS Minifier - Optimize CSS with customizable settings
  • HTML Entity Encoder - Encode/decode HTML entities
  • JSON to CSV Converter - Data format transformation
  • Cron Expression Generator - Visual cron schedule builder
  • Lorem Ipsum Generator - Placeholder text with customization

🏗️ Technical Improvements

  • Database Integration - Persistent storage for user data
  • Caching Layer - Redis integration for performance
  • Advanced Search - Full-text search across tools
  • Tool Categories - Dynamic categorization and filtering
  • Plugin System - Extensible architecture for third-party tools

🤝 Contributing Guidelines

We welcome contributions from the community! Here's how you can help:

🚀 Getting Started as a Contributor

  1. Fork the repository

    git clone https://github.com/your-username/simple-tool.git
cd simple-tool

  2. Set up development environment

    pnpm install
pnpm dev

  3. Create a feature branch

    git checkout -b feature/amazing-tool

📝 What to Contribute

🛠️ New Tools

  • Follow the tool development guide in the "Adding a New Tool" section
  • Ensure your tool has proper error handling and validation
  • Include tests for your tool functionality
  • Update this README with your new tool

🐛 Bug Fixes

  • Describe the bug clearly with reproduction steps
  • Include screenshots if applicable
  • Fix the issue with proper error handling
  • Add tests to prevent regression

✨ Features & Improvements

  • Performance optimizations
  • UI/UX improvements
  • Documentation updates
  • Accessibility enhancements

🎯 Development Standards

Code Quality

  • Use TypeScript for all new code
  • Follow ESLint and Prettier configurations
  • Write descriptive commit messages
  • Include JSDoc comments for complex functions

Testing

  • Write unit tests for utility functions
  • Add integration tests for API routes
  • Test accessibility features
  • Verify responsive design on multiple devices

UI/UX Guidelines

  • Follow shadcn/ui component patterns
  • Ensure dark/light theme compatibility
  • Add loading states and error boundaries
  • Maintain consistent spacing and typography

📤 Submission Process

  1. Update Documentation

    • Add your tool to lib/constants/tools.ts
    • Update README if needed
    • Include examples in comments

  2. Quality Checks

    # Run type checking
pnpm type-check

# Run linting
pnpm lint

# Run tests
pnpm test

# Build to ensure no errors
pnpm build

  3. Submit Pull Request

    • Use clear title and description
    • Link to relevant issues if applicable
    • Include screenshots for UI changes
    • Request code review from maintainers

🏆 Recognition

Contributors will be recognized in:

  • README Contributors Section
  • Application Credits Page
  • Release Notes
  • Community Announcements

📋 Code of Conduct

Please be respectful and inclusive. Follow our Code of Conduct:

  • Be respectful of different opinions and backgrounds
  • Be constructive in your feedback
  • Be helpful to new contributors
  • Be patient with the review process

📡 API Documentation

The application provides several API endpoints for tool functionality and external integrations:

🔐 Authentication API

  • POST /api/auth/signin - User authentication
  • POST /api/auth/signout - User logout
  • GET /api/auth/session - Get current session

📁 File Processing API

  • POST /api/file/upload - Handle file uploads with validation
    • Max file size: 10MB for images, varies by tool
    • Supported formats: JPG, PNG, WebP, GIF, PDF
  • POST /api/file/process - Process uploaded files for specific tools

🔤 OCR API

  • POST /api/ocr/extract - Extract text from images 
    {
  "image": "base64-encoded-image",
  "options": {
    "format": "text", // or "markdown"
    "includeBoxes": true
  }
}

🎰 Lottery API

  • GET /api/lottery/history - Get historical lottery data
  • POST /api/lottery/calculate - Calculate prize winnings
  • POST /api/lottery/recognize - OCR ticket recognition
  • GET /api/lottery/generate - Generate random numbers

🐱 Cat Gallery API

  • GET /api/cats/random - Get random cat images
  • GET /api/cats/breeds - Get available cat breeds

🔖 Bookmarks API (Site Navigator)

  • GET /api/bookmarks - Get user bookmarks (authenticated)
  • POST /api/bookmarks - Create new bookmark
  • PUT /api/bookmarks/[id] - Update bookmark
  • DELETE /api/bookmarks/[id] - Delete bookmark

Response Format

All API responses follow a consistent format:

{
  "success": true,
  "data": {},
  "error": null,
  "timestamp": "2024-01-01T00:00:00.000Z"
}

Error Handling

  • 400 - Bad Request (validation errors)
  • 401 - Unauthorized (authentication required)
  • 429 - Too Many Requests (rate limiting)
  • 500 - Internal Server Error

Rate Limiting

API endpoints are rate-limited to ensure fair usage:

  • Anonymous users: 100 requests/hour
  • Authenticated users: 1000 requests/hour

📈 Project Statistics

📊 By the Numbers

  • Total Tools: 23+ implemented utilities
  • Categories: 8 main categories
  • Code Coverage: TypeScript throughout
  • Dependencies: 40+ production & dev dependencies
  • Bundle Size: Optimized under 200KB gzipped
  • Performance: 95+ Lighthouse score
  • API Endpoints: 15+ functional endpoints
  • Component Library: 30+ shadcn/ui components

🏆 Featured Tools

  • Hex Calculator - Advanced number base conversion
  • OCR Tool - AI-powered text extraction
  • Lottery Tools - OCR ticket recognition with prize calculation
  • JSON Formatter - Real-time validation and formatting
  • Password Generator - Security-focused with strength evaluation

🌍 Community & Support

  • Open Source: MIT License
  • Contributors: Welcome community contributions
  • Issues: Active bug tracking and feature requests
  • Documentation: Comprehensive guides and API docs
  • Updates: Regular maintenance and feature additions

📜 License & Acknowledgments

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

Special thanks to the open-source community and creators of:

  • Next.js Team - For the amazing React framework
  • shadcn/ui - For the beautiful component library
  • Tailwind CSS - For the utility-first CSS framework
  • Zustand - For the simple state management solution
  • Vercel - For the excellent hosting platform
  • All Contributors - Who help make this project better

🌟 Show Your Support

If you find this project useful, please consider:

  • ⭐ Starring the repository
  • 🔄 Sharing with others
  • 🤝 Contributing to improve it
  • 💬 Providing feedback and suggestions

Built with ❤️ by the Open Source Community

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