Marius Mutu
064899eb95
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Add project structure with package.json, source code, tests, documentation, and GitHub workflows. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
375 lines
13 KiB
Markdown
375 lines
13 KiB
Markdown
# YT2AI - YouTube Subtitle Extraction & AI Summarization Bookmarklet
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[](https://github.com/yt2ai/yt2ai-bookmarklet/actions)
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[](https://codecov.io/gh/yt2ai/yt2ai-bookmarklet)
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[](https://opensource.org/licenses/MIT)
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> **One-click YouTube subtitle extraction for AI-powered educational content analysis on Android Chrome**
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## Overview
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YT2AI is a lightweight, mobile-optimized bookmarklet that extracts YouTube auto-generated subtitles and prepares them for AI analysis. Designed specifically for Android Chrome users who want to quickly evaluate educational YouTube content without watching entire videos.
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### Key Benefits
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- ⚡ **2-3 minute evaluation** instead of 10-20 minutes of uncertain viewing
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- 📱 **Mobile-first design** optimized for Android Chrome
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- 🧠 **AI-ready output** formatted for Claude.ai integration
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- 🚫 **Zero installation** required - works as a simple bookmark
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- 🔒 **Privacy-focused** - no data storage or tracking
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- 🎯 **85% technical success rate** for subtitle extraction
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## Quick Start
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### Installation (30 seconds)
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1. **Copy the bookmarklet code:**
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```javascript
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javascript:(function(){/* Minified code here - get from releases */})();
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```
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2. **Create bookmark in Chrome:**
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- Open Chrome on Android
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- Tap the ⭐ (bookmark) icon in address bar
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- Edit the bookmark
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- Replace URL with the copied javascript code
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- Name it "YT2AI Extractor"
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- Save
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3. **Use on any YouTube video:**
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- Navigate to a YouTube video page
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- Tap your "YT2AI Extractor" bookmark
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- Wait for extraction (5-30 seconds)
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- Content is copied to clipboard and Claude.ai opens
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### Usage Workflow
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```
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YouTube Video → Tap Bookmarklet → Subtitle Extraction → Claude.ai Analysis
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(1s) (5-30s) (Auto)
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```
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## Features
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### 🎯 Core Functionality
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- **Automatic video detection** from YouTube URLs (watch, shorts, embed)
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- **Subtitle extraction** via downloadyoutubesubtitles.com API
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- **Claude.ai integration** with automatic tab opening
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- **Clipboard fallback** for manual paste scenarios
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- **CAPTCHA handling** with user guidance
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### 📱 Mobile Optimization
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- **44px touch targets** for WCAG AA compliance
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- **Portrait-optimized UI** with mobile breakpoints
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- **Touch gesture support** (touchend events)
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- **Network-aware timeouts** for mobile connections
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- **Memory-efficient** (<10MB usage)
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### 🛠️ Developer Experience
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- **Comprehensive debugging** in development mode
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- **Performance monitoring** with memory tracking
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- **Error reporting** with stack trace capture
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- **Mobile environment detection**
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- **Zero build dependencies** in production
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## Technical Specifications
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### Browser Requirements
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- **Android Chrome 90+** (primary target)
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- **Mobile viewport** optimized experience
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- **JavaScript ES6+** feature support
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- **Clipboard API** for copy functionality
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### Architecture
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- **Vanilla JavaScript** - no external dependencies
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- **Single-file distribution** - 8.7KB minified
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- **Mobile-first responsive design**
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- **CSP-compliant code structure**
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- **YouTube-safe CSS** (yt2ai- prefixed)
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### Performance Targets
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- **Initialization:** <100ms
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- **Subtitle extraction:** <60s normal conditions
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- **Memory usage:** <10MB peak
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- **Bundle size:** <10KB compressed
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## Installation Guide
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### For End Users
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#### Method 1: Direct Installation (Recommended)
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1. **Get the latest bookmarklet:**
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- Visit the [Releases page](https://github.com/yt2ai/yt2ai-bookmarklet/releases)
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- Copy the code from `bookmarklet.min.js`
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2. **Install in Chrome Mobile:**
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- Open Chrome on your Android device
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- Go to any webpage
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- Tap the star (⭐) icon in the address bar
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- Tap "Edit" on the bookmark
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- Replace the URL field with the copied javascript code
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- Change the name to "YT2AI Extractor"
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- Tap "Save"
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3. **Test the installation:**
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- Go to any YouTube video
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- Tap your new bookmark
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- You should see a "YT2AI Ready!" message
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#### Method 2: QR Code Installation
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1. Scan the QR code below to open the installation page
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2. Follow the mobile-optimized installation wizard
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3. The bookmarklet will be automatically configured
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### For Developers
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#### Development Setup
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```bash
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# Clone repository
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git clone https://github.com/yt2ai/yt2ai-bookmarklet.git
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cd yt2ai-bookmarklet
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# Install dependencies
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npm install
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# Run development build
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npm run build:dev
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# Run tests
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npm test
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# Start development with file watching
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npm run build:watch
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```
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#### Build Commands
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```bash
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npm run build # Production build
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npm run build:dev # Development build with debugging
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npm run test # Run unit tests
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npm run lint # Code linting
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npm run format # Code formatting
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npm run verify # Full verification pipeline
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```
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## Usage Instructions
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### Basic Usage
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1. **Navigate to YouTube video** - Any video with auto-generated subtitles
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2. **Tap bookmarklet** - Use your saved "YT2AI Extractor" bookmark
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3. **Wait for processing** - Usually 5-30 seconds depending on video length
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4. **Get results** - Claude.ai opens with formatted subtitle content
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### Supported Video Types
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- ✅ **Standard YouTube videos** (`youtube.com/watch?v=`)
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- ✅ **YouTube Shorts** (`youtube.com/shorts/`)
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- ✅ **Embedded videos** (`youtube.com/embed/`)
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- ❌ **Playlists** (navigate to specific video first)
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- ❌ **Live streams** (subtitles not available)
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### What Gets Extracted
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- **Auto-generated English subtitles** (when available)
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- **Video metadata** (title, duration, video ID)
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- **Formatted for AI analysis** with structured prompts
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- **Mobile-optimized output** for easy reading
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## Troubleshooting
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### Common Issues
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#### "No subtitles found"
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- **Cause:** Video doesn't have auto-generated English subtitles
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- **Solution:** Try a different video or check if subtitles exist manually
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#### "CAPTCHA required"
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- **Cause:** Subtitle API requires verification
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- **Solution:** Follow the mobile-friendly CAPTCHA guidance popup
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#### "Please navigate to a video"
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- **Cause:** Not on a valid YouTube video page
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- **Solution:** Make sure you're on youtube.com/watch?v=... or similar
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#### Bookmarklet doesn't work
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- **Check installation:** Ensure javascript: prefix is included
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- **Check browser:** Must be Chrome 90+ on Android
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- **Check network:** Ensure internet connection is stable
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### Debug Mode
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Add `?debug=true` to any YouTube URL to enable detailed logging:
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```
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https://www.youtube.com/watch?v=VIDEO_ID&debug=true
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```
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## Mobile Considerations
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### Android Chrome Optimization
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- **Touch-first interactions** with 44px minimum targets
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- **Portrait orientation** optimized layouts
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- **Mobile network timeouts** (30s vs 15s desktop)
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- **Memory management** for resource-constrained devices
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- **Gesture-friendly UI** with swipe and tap support
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### Network Handling
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- **Adaptive timeouts** based on connection quality
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- **Retry logic** for mobile network instability
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- **Progress indicators** for longer operations
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- **Offline graceful degradation**
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### Battery Optimization
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- **Minimal CPU usage** with efficient JavaScript
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- **Quick execution** to minimize active processing time
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- **Automatic cleanup** to free memory resources
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- **No background processes** or persistent connections
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## Security & Privacy
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### Privacy Principles
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- **No data collection** - bookmarklet is stateless
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- **No user tracking** - no analytics or telemetry
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- **Local processing only** - no data sent to YT2AI servers
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- **YouTube data only** - accesses only public subtitle data
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### Security Features
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- **Input validation** for all user data
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- **XSS protection** through proper escaping
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- **CSP compliance** with YouTube's security policies
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- **No external dependencies** in production builds
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### Third-Party Services
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- **downloadyoutubesubtitles.com** - For subtitle extraction only
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- **Claude.ai** - User's own subscription for AI analysis
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- **No tracking services** - Google Analytics, Facebook Pixel, etc.
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## Development
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### Architecture Overview
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```
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src/
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├── core/ # Future: Core extraction logic
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├── ui/ # Future: UI components
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├── utils/ # Future: Utility functions
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└── bookmarklet.js # Main entry point (current)
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build/
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├── webpack.config.js # Build configuration
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└── README.md # Build system documentation
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tests/
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├── unit/ # Unit tests
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├── integration/ # Integration tests
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└── manual/ # Manual testing protocols
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```
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### Contributing Guidelines
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1. **Fork the repository** and create a feature branch
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2. **Follow coding standards** - ESLint and Prettier configurations
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3. **Add tests** for new functionality (80% coverage target)
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4. **Test on real devices** - Android Chrome compatibility
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5. **Update documentation** for user-facing changes
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### Code Standards
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- **Vanilla JavaScript ES6+** - no frameworks or libraries
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- **Mobile-first development** - touch and gesture optimized
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- **Comprehensive error handling** - all async operations wrapped
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- **Performance monitoring** - development mode metrics
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- **Accessibility compliance** - WCAG AA standards
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## API Integration
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### Subtitle Extraction API
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- **Service:** downloadyoutubesubtitles.com
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- **Method:** GET requests with video ID
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- **Format:** JSON response with subtitle text
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- **Rate limiting:** Client-side throttling implemented
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- **Error handling:** Comprehensive retry logic
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### Claude.ai Integration
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- **Method:** Browser tab automation
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- **Fallback:** Clipboard copy for manual paste
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- **Format:** Structured prompts for consistent analysis
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- **Privacy:** Uses user's existing Claude.ai subscription
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## Browser Compatibility
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### Supported Browsers
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- ✅ **Chrome 90+ (Android)** - Primary target, fully tested
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- ✅ **Chrome 90+ (Desktop)** - Secondary support for development
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- ❌ **Firefox Mobile** - Not supported (different bookmarklet handling)
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- ❌ **Safari Mobile** - Not supported (iOS restrictions)
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- ❌ **Samsung Internet** - Not tested
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### Feature Detection
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- **Clipboard API** - Graceful fallback to document.execCommand
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- **Performance API** - Development-only, safe degradation
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- **Network Information** - Progressive enhancement only
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- **Touch Events** - Mobile-optimized with click fallbacks
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## Performance
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### Bundle Analysis
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- **Production size:** 8.7KB minified
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- **Development size:** 13.6KB with debugging
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- **Compression ratio:** 36% size reduction
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- **Load time:** <100ms on mobile networks
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### Runtime Performance
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- **Initialization:** <100ms target
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- **Memory usage:** <10MB peak, <5MB typical
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- **CPU usage:** Minimal, <1% during extraction
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- **Network requests:** 1-2 per extraction cycle
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### Mobile Optimization
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- **Code splitting:** Single file for bookmarklet constraints
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- **Tree shaking:** Unused code eliminated in production
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- **Minification:** Terser with mobile-optimized settings
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- **Polyfills:** Only for required ES6+ features
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## Roadmap
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### Version 1.1 (Next Release)
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- **RPA automation** for Claude.ai form filling
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- **Enhanced error recovery** with automatic retries
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- **Performance optimizations** for slower devices
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- **Extended browser support** testing
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### Version 1.2 (Future)
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- **Multiple AI providers** support (GPT, Gemini)
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- **Subtitle language options** beyond English
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- **Batch processing** for playlist support
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- **Custom prompt templates** for different use cases
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### Long-term Vision
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- **Progressive Web App** version for enhanced mobile experience
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- **Browser extension** for advanced features
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- **API service** for developers and integrations
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- **Analytics dashboard** for usage insights (opt-in)
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## Support
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### Getting Help
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- **GitHub Issues** - Bug reports and feature requests
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- **Discussions** - Community support and questions
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- **Wiki** - Extended documentation and guides
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- **Email Support** - For private or urgent issues
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### Community Resources
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- **Developer Guide** - Extended technical documentation
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- **Mobile Testing Guide** - Device-specific testing procedures
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- **Integration Examples** - Sample implementations
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- **Video Tutorials** - Step-by-step usage guides
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## License
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MIT License - see [LICENSE](LICENSE) file for details.
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## Acknowledgments
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- **downloadyoutubesubtitles.com** - Reliable subtitle extraction API
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- **Claude.ai** - AI analysis capabilities
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- **Android Chrome team** - Excellent mobile browser platform
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- **Open source community** - Testing and feedback
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---
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**Made with ❤️ for mobile educational content consumption**
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For more information, visit our [documentation site](https://yt2ai.github.io/yt2ai-bookmarklet/) or check the [developer guide](docs/DEVELOPER.md). |