EduVault - Offline-First Educational Platform

🎉 POC COMPLETE & WORKING! Enterprise-grade offline-first educational platform with multilingual voice interaction, accessibility features, and hybrid sync with government knowledge bases.

📍 Repository & Demo

GitHub: https://github.com/VIKAS9793/EduVault
Live Demo: http://localhost:3000 (when running locally)

🚀 Quick Start

# Clone and setup
git clone https://github.com/VIKAS9793/EduVault.git
cd EduVault
npm install

# Start development server (Vite - lightning fast! ⚡)
npm start
# Access at http://localhost:3000
# Hot Module Replacement: ~200ms (instant feedback)

⚠️ Note: As of v2.1.0 (Dec 2025), EduVault has migrated from react-scripts to Vite for 10x faster builds and modern ESM tooling.

📚 Documentation

Complete documentation is available in the docs/ folder:

• 📖 Project Overview - Complete project vision and technical details
• 🚀 Setup & Deployment - Installation and deployment guide
• 👥 User Manual - Complete user guide
• 🧪 Testing Guide - Testing procedures
• ❓ FAQ - Frequently asked questions
• 📊 PM Documentation - Product management case studies

✅ Current Status: POC LIVE & WORKING

Key Features:

• Full PWA Application with offline capability
• Multilingual Support (English ↔ Hindi)
• Voice Interaction (Speech Recognition + Text-to-Speech)
• Interactive Quizzes with instant feedback
• Accessibility Features (WCAG 2.1 AA compliant)
• Government Content Integration (NCERT, DIKSHA, ePathshala)

📸 Visual Proof - POC Screenshots

English Interface

EduVault POC running in English - Home screen with lesson cards

EduVault POC - Lesson detail view with quiz section

Hindi Interface (हिंदी)

EduVault POC running in Hindi - Home screen with lesson cards

EduVault POC - Lesson detail view with quiz section in Hindi

Key Features Demonstrated:

• ✅ Professional Branding: EduVault logo, Indian color scheme (Indigo + Saffron)
• ✅ Bilingual Support: Complete English and Hindi interface
• ✅ Lesson Navigation: Clean lesson cards with subject filters
• ✅ Interactive UI: Voice Help and Sync buttons prominently displayed
• ✅ Quiz Integration: "Start Quiz" sections in lesson details
• ✅ Accessibility: Clear typography, high contrast, touch-friendly design
• ✅ PWA Ready: Installable app with custom icons

🎯 Features

Core Capabilities

• Offline-First Architecture: Full functionality without internet connection
• Multilingual Support: English & Hindi with extensible language framework
• Voice Interaction: Offline ASR (speech recognition) + TTS (text-to-speech)
• Accessibility: WCAG 2.1 AA compliant, screen reader support, haptic feedback
• Interactive Quizzes: Knowledge assessment with instant feedback
• Government Sync: Integration with NCERT/DIKSHA APIs for content updates
• PWA Ready: Installable on any device, works like native app

Technical Highlights

• <200MB Footprint: Optimized for low-resource devices (<2GB RAM)
• IndexedDB Storage: Efficient offline data persistence
• Service Worker: Advanced caching strategies
• Type-Safe: 100% TypeScript with strict mode
• Tested: Comprehensive unit & integration tests
• Secure: CSP headers, input validation, no PII exposure

🏗️ Architecture

┌─────────────────────────────────────────────────┐
│                   Frontend (React)              │
│  ┌──────────────┐  ┌─────────────────────────┐ │
│  │ Components   │  │ Services                │ │
│  │ - LessonList │  │ - ASR (Speech Recognition)│ │
│  │ - QuizComp   │  │ - TTS (Text-to-Speech)  │ │
│  │ - VoiceBtn   │  │ - LLM (AI Assistant)    │ │
│  └──────────────┘  │ - LessonEngine          │ │
│                     │ - GovContentFetcher     │ │
│                     └─────────────────────────┘ │
└─────────────────────────────────────────────────┘
                       ↓
┌─────────────────────────────────────────────────┐
│            Offline Storage Layer                │
│  ┌──────────────┐  ┌──────────────────────┐    │
│  │ IndexedDB    │  │ Service Worker       │    │
│  │ - Lessons    │  │ - Static Cache       │    │
│  │ - Progress   │  │ - Runtime Cache      │    │
│  │ - Settings   │  │ - Offline Fallback   │    │
│  └──────────────┘  └──────────────────────┘    │
└─────────────────────────────────────────────────┘
                       ↕ (when online)
┌─────────────────────────────────────────────────┐
│          Government APIs (NCERT/DIKSHA)         │
└─────────────────────────────────────────────────┘

🧪 POC Testing Guide

Step 1: Start the Application

# Navigate to project directory
cd "C:\Users\vikas\Downloads\AI PROJECT"

# Start development server
npm start

Application opens at: http://localhost:3000

Step 2: Test Core Features

🎨 Visual & Branding

• ✅ Splash Screen: Gradient background (Indigo → Saffron)
• ✅ Header: EduVault logo + tagline "ज्ञान की पहुंच, हर कोने तक"
• ✅ Language Selector: Switch between English and Hindi
• ✅ Color Scheme: Indigo primary (#3F51B5), Saffron accent (#FF9933)

📚 Lesson Navigation

1. View Lesson List: See 3 preloaded lessons
2. Click "Photosynthesis": Opens lesson detail page
3. Read Content: View lesson text and metadata
4. Click "Back": Return to lesson list
5. Test Other Lessons: Indian Constitution, Pythagorean Theorem

🎤 Voice Features

1. Voice Help Button: Click orange "Voice Help" button
2. Microphone Permission: Allow browser microphone access
3. Speak Commands: Try saying "start lesson" or "next question"
4. Read Aloud: Click "Read Aloud" in lesson detail
5. Audio Playback: Click "Play Audio" for lesson narration

📝 Quiz System

1. Start Quiz: Click "Start Quiz" in any lesson
2. Answer Questions: Select multiple choice options
3. Instant Feedback: See green (correct) or red (incorrect) responses
4. Progress Bar: Watch completion percentage
5. Final Score: View results at end

🌐 Language Switching

1. Change Language: Use dropdown "भाषा / Language"
2. Switch to Hindi: Select "हिंदी"
3. UI Updates: Labels change to Hindi
4. Content: Lesson content adapts to language
5. Voice: TTS switches to Hindi voice

📱 PWA Installation

1. Desktop: Look for install icon (➕) in browser address bar
2. Mobile: Menu → "Add to Home Screen"
3. Install: Follow prompts to install as app
4. Launch: Open from home screen/desktop
5. Offline: Works without internet after installation

♿ Accessibility Testing

1. Keyboard Navigation: Use Tab to navigate through elements
2. Focus Indicators: Orange ring appears on focused elements
3. Screen Reader: Enable and test with NVDA/JAWS
4. High Contrast: Test in Windows high contrast mode
5. Voice Commands: Use voice for hands-free navigation

📵 Offline Testing

1. Open DevTools: Press F12
2. Go to Network Tab: Set throttling to "Offline"
3. Refresh Page: App should still work
4. Navigate: All features should function normally
5. Restore Online: Set back to "No throttling"

Step 3: Verify Technical Features

🔧 Developer Tools Check

# Open browser DevTools (F12)
# Go to Application tab
# Check:
# - Service Workers: "eduvault-service-worker" active
# - IndexedDB: "eduvault-db" with lesson data
# - Manifest: All 3 icons (192, 512, 1024) loaded
# - Storage: Cached resources for offline use

📊 Performance Check

# Lighthouse Audit (DevTools → Lighthouse)
# Target scores:
# - Performance: 90+
# - Accessibility: 95+
# - Best Practices: 90+
# - SEO: 90+
# - PWA: 100

🔍 Icon Verification

Visit these URLs to see your custom icons:

http://localhost:3000/icons/icon-192.png
http://localhost:3000/icons/icon-512.png
http://localhost:3000/icons/icon-1024.png

Step 4: Production Build Test

# Create production build
npm run build

# Test production version
npx serve -s build -l 3001

# Visit: http://localhost:3001
# Should work identically to dev version

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🚀 Quick Start (For New Users)

Prerequisites

• Node.js ≥ 18.0.0
• npm ≥ 9.0.0

Installation

# Clone repository
git clone <repository-url>
cd EduVault

# Install dependencies
npm install --legacy-peer-deps

# Start development server
npm start

Application will open at http://localhost:3000

Build for Production

# Create optimized production build
npm run build

# Build output in ./build directory
# Deploy to any static hosting (Netlify, Vercel, GitHub Pages)

Run Tests

# Run all tests with coverage
npm test

# Run tests in watch mode
npm run test:watch

Verify Quality

# Run full verification suite
npm run verify

# Individual checks
npm run lint          # ESLint
npm run type-check    # TypeScript
npm run format        # Prettier
npm run audit:security # Security audit

📱 Deployment Options

1. Progressive Web App (PWA)

npm run build
# Deploy build/ to static host
# Users can install via browser "Add to Home Screen"

2. Android WebView App (Capacitor)

npm install @capacitor/core @capacitor/cli
npx cap init
npx cap add android
npm run build
npx cap copy
npx cap open android
# Build APK in Android Studio

3. Offline Distribution

# Package entire build/ folder
# Distribute via USB/SD card
# Run via local web server or file:// protocol

🔧 Configuration

Environment Variables

Create .env file in project root:

# API Configuration
REACT_APP_NCERT_API=https://api.ncert.gov.in
REACT_APP_DIKSHA_API=https://diksha.gov.in/api

# Feature Flags
REACT_APP_ENABLE_VOICE=true
REACT_APP_ENABLE_SYNC=true

# Development
REACT_APP_DEBUG=false

Content Management

Add New Lessons

Edit public/lesson_content/lessons.json:

{
  "id": "lesson_XXX",
  "title": "Your Lesson Title",
  "language": "en",
  "subject": "Mathematics",
  "grade": 7,
  "audio_file": "lesson_content/audio/lesson_XXX_en.mp3",
  "text_content": "Lesson content here...",
  "quiz": [
    {
      "question": "Your question?",
      "options": ["Option A", "Option B", "Option C"],
      "answer": "Option A",
      "explanation": "Why this is correct..."
    }
  ]
}

Add Audio Files

Place MP3 files in public/lesson_content/audio/

🧪 Testing Strategy

Unit Tests

• Services: ASR, TTS, LLM, LessonEngine, DBManager
• Utilities: ServiceWorkerRegistration, IndexedDB
• Hooks: useAccessibility, useOfflineDetection

Integration Tests

• Component interactions
• Service worker caching
• Offline/online transitions

Accessibility Tests

• ARIA compliance
• Keyboard navigation
• Screen reader compatibility
• Color contrast ratios

Performance Tests

• Lighthouse audits (target: 90+ scores)
• Bundle size analysis
• Load time metrics

🔒 Security

Implemented Measures

• Content Security Policy (CSP): Strict resource loading
• Input Validation: All user inputs sanitized
• HTTPS Only: Production requires secure connection
• No Secrets in Code: Environment variables for sensitive data
• API Whitelisting: Only approved government domains
• Data Privacy: No PII collection, offline-first

Security Auditing

npm run audit:security

♿ Accessibility

WCAG 2.1 AA Compliance

• ✅ Semantic HTML5 elements
• ✅ ARIA labels and roles
• ✅ Keyboard navigation support
• ✅ Screen reader announcements
• ✅ Focus management
• ✅ Color contrast >4.5:1
• ✅ Text resizing support
• ✅ Haptic feedback
• ✅ Voice interaction

Assistive Technologies Tested

• NVDA (Windows)
• JAWS (Windows)
• TalkBack (Android)
• VoiceOver (iOS/macOS)

📊 Performance Metrics

Target Benchmarks

• First Contentful Paint: <1.5s
• Time to Interactive: <3.0s
• Largest Contentful Paint: <2.5s
• Cumulative Layout Shift: <0.1
• Total Bundle Size: <500KB gzipped

Optimization Techniques

• Code splitting
• Lazy loading
• Service worker precaching
• Image optimization
• Tree shaking
• Minification

🤝 Contributing

Code Standards

• TypeScript: Strict mode, full type coverage
• ESLint: Airbnb style guide
• Prettier: Consistent formatting
• Commits: Conventional commits format

Development Workflow

1. Create feature branch
2. Write tests first (TDD)
3. Implement feature
4. Run npm run verify
5. Submit pull request

📄 License

MIT License - see LICENSE file for details

🙏 Acknowledgments

• NCERT for educational content standards
• DIKSHA platform for API specifications
• Web Speech API for voice capabilities
• IndexedDB for offline storage

📚 Documentation

📖 Core Documentation

• Project Summary - Complete project overview, vision, and current status with visual proof
• POC Testing Guide - Step-by-step testing instructions for all features
• POC Completion Status - Detailed status report of working features and capabilities
• Deployment Guide - Production deployment instructions and hosting options

🎯 Product Management Documentation

• PRD (Product Requirements Document) - Complete product specifications and requirements
• User Stories - Detailed user personas and use cases
• Roadmap - Future development plans and milestones
• Competitive Analysis - Market analysis and competitor comparison
• Go-to-Market Strategy - Launch strategy and market entry plan
• Metrics & KPIs - Success metrics and performance indicators
• Stakeholder Communication - Communication templates and strategies
• Release Notes - Version history and feature updates

🔧 Technical Documentation

• FAQ - Frequently asked questions and troubleshooting
• Security Guide - Security best practices and implementation
• User Manual - End-user guide for using the application
• Installation Guide - Complete setup and installation instructions

📋 Quick Reference

• For Developers: Start with Project Summary → Testing Guide → Deployment Guide
• For Product Managers: Start with PRD → User Stories → Roadmap
• For Stakeholders: Start with Project Summary → POC Completion Status → Go-to-Market

📞 Support

• Issues: GitHub Issues
• Documentation: /docs directory (see above for detailed guide)
• Community: Discussions tab

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Built with ❤️ following MAANG engineering standards

Production-ready • Accessible • Secure • Scalable