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.gitignore

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+# Dependencies
+node_modules/
+
+# Downloads folder
+downloads/
+
+# Environment variables
+.env
+
+# Logs
+*.log
+npm-debug.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# Temporary files
+tmp/
+temp/

.spacesignore

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+node_modules/
+downloads/
+*.log
+.env
+.DS_Store
+test.js
+.git/

DEPLOY_GUIDE.md

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+# 🚀 Hướng dẫn Deploy lên Hugging Face Spaces
+
+## Bước 1: Chuẩn bị Repository
+
+Đã có sẵn: https://github.com/pedguedes090/ytdlp_web
+
+## Bước 2: Tạo Hugging Face Space
+
+1. Đi tới https://huggingface.co/new-space
+2. Điền thông tin:
+   - **Space name**: `ytdlp-web` (hoặc tên bạn muốn)
+   - **License**: MIT
+   - **SDK**: Docker 
+   - **Hardware**: CPU basic (miễn phí)
+
+## Bước 3: Clone và Setup
+
+```bash
+git clone https://huggingface.co/spaces/[YOUR_USERNAME]/ytdlp-web
+cd ytdlp-web
+```
+
+## Bước 4: Copy files từ GitHub repo
+
+Copy tất cả files từ repository GitHub vào thư mục Hugging Face Space:
+
+```
+ytdlp-web/
+├── Dockerfile          # ✅ Đã tạo
+├── README.md           # Thay bằng README_HF.md  
+├── .spacesignore       # ✅ Đã tạo
+├── app.js              # ✅ Đã cập nhật port 7860
+├── demo.html           # ✅ Đã cập nhật API_BASE
+├── package.json        
+├── config.json
+└── downloads/          # Sẽ tự tạo
+```
+
+## Bước 5: Cập nhật README.md
+
+Đổi tên `README_HF.md` thành `README.md` để Hugging Face hiển thị metadata đúng.
+
+## Bước 6: Push lên Hugging Face
+
+```bash
+git add .
+git commit -m "Initial deploy to Hugging Face Spaces"
+git push
+```
+
+## Bước 7: Kiểm tra Deploy
+
+- Hugging Face sẽ tự động build Docker image
+- Có thể mất 5-10 phút để build xong
+- Truy cập URL của Space để kiểm tra
+
+## 🔧 Cấu hình quan trọng
+
+### Dockerfile highlights:
+- Base image: `python:3.11-slim`
+- Cài ffmpeg, nodejs, npm
+- Install yt-dlp qua pip
+- Port 7860 (mặc định của HF)
+- Bind `0.0.0.0` để accessible
+
+### App.js changes:
+- Port: `process.env.PORT || 7860`
+- Listen: `app.listen(PORT, '0.0.0.0')`
+
+### Demo.html changes:
+- API_BASE: `window.location.origin` (tự động)
+
+## 🚨 Lưu ý
+
+1. **Miễn phí**: HF Spaces có giới hạn CPU và memory
+2. **Timeout**: Apps có thể sleep sau một thời gian không dùng
+3. **Storage**: File sẽ mất khi app restart (đã có auto-cleanup)
+4. **Public**: Space sẽ public trừ khi upgrade Pro
+
+## 🎯 URL sau khi deploy
+
+```
+https://huggingface.co/spaces/[YOUR_USERNAME]/ytdlp-web
+```
+
+## 🛠️ Troubleshooting
+
+- **Build failed**: Kiểm tra Dockerfile syntax
+- **App không start**: Kiểm tra port 7860
+- **API không hoạt động**: Kiểm tra CORS và API_BASE
+- **No space left**: Bật auto-cleanup trong config.json

Dockerfile

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+# Dockerfile for Hugging Face Spaces
+FROM python:3.11-slim
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    curl \
+    wget \
+    ffmpeg \
+    nodejs \
+    npm \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install yt-dlp
+RUN pip install yt-dlp
+
+# Copy package files first for better caching
+COPY package*.json ./
+
+# Install Node.js dependencies
+RUN npm install
+
+# Copy application files
+COPY . .
+
+# Create downloads directory
+RUN mkdir -p downloads
+
+# Expose port 7860 (Hugging Face Spaces default)
+EXPOSE 7860
+
+# Set environment variable for Hugging Face
+ENV PORT=7860
+
+# Start the application
+CMD ["npm", "start"]

app.js

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+const express = require('express');
+const cors = require('cors');
+const { exec } = require('child_process');
+const fs = require('fs');
+const path = require('path');
+const crypto = require('crypto');
+
+const app = express();
+const PORT = process.env.PORT || 7860; // Hugging Face Spaces sử dụng port 7860
+
+// Middleware
+app.use(cors());
+app.use(express.json());
+
+// Serve static files (for demo.html)
+app.use(express.static(__dirname));
+
+// Tạo thư mục downloads nếu chưa tồn tại
+const downloadsDir = path.join(__dirname, 'downloads');
+if (!fs.existsSync(downloadsDir)) {
+    fs.mkdirSync(downloadsDir);
+}
+
+// Auto-cleanup function - xóa file sau 5 phút
+function scheduleFileCleanup(filePath, delay = 5 * 60 * 1000) { // 5 phút
+    setTimeout(() => {
+        if (fs.existsSync(filePath)) {
+            fs.unlinkSync(filePath);
+            console.log(`🗑️ Đã xóa file: ${path.basename(filePath)}`);
+        }
+    }, delay);
+}
+
+// Generate unique ID for files
+function generateFileId() {
+    return crypto.randomBytes(8).toString('hex');
+}
+
+// Route để lấy thông tin video
+app.post('/video-info', async (req, res) => {
+    const { url } = req.body;
+    
+    if (!url) {
+        return res.status(400).json({ error: 'URL là bắt buộc' });
+    }
+
+    const command = `yt-dlp --dump-json "${url}"`;
+    
+    exec(command, (error, stdout, stderr) => {
+        if (error) {
+            console.error('Lỗi:', error);
+            return res.status(500).json({ error: 'Không thể lấy thông tin video', details: stderr });
+        }
+        
+        try {
+            const videoInfo = JSON.parse(stdout);
+            res.json({
+                title: videoInfo.title,
+                duration: videoInfo.duration,
+                uploader: videoInfo.uploader,
+                view_count: videoInfo.view_count,
+                thumbnail: videoInfo.thumbnail,
+                formats: videoInfo.formats.map(format => ({
+                    format_id: format.format_id,
+                    ext: format.ext,
+                    resolution: format.resolution,
+                    filesize: format.filesize,
+                    quality: format.quality
+                }))
+            });
+        } catch (parseError) {
+            res.status(500).json({ error: 'Lỗi phân tích dữ liệu video' });
+        }
+    });
+});
+
+// Route để tải video
+app.post('/download', async (req, res) => {
+    const { url, format = 'video', quality = 'best' } = req.body;
+    
+    if (!url) {
+        return res.status(400).json({ error: 'URL là bắt buộc' });
+    }
+
+    // Tạo ID duy nhất cho file
+    const fileId = generateFileId();
+    const timestamp = Date.now();
+    
+    let command;
+    let expectedExtension;
+    
+    if (format === 'audio') {
+        // Tải audio
+        expectedExtension = 'mp3';
+        const outputTemplate = path.join(downloadsDir, `${fileId}.%(ext)s`);
+        command = `yt-dlp -x --audio-format mp3 --audio-quality ${quality} -o "${outputTemplate}" "${url}"`;
+    } else {
+        // Tải video
+        expectedExtension = 'mp4';
+        const outputTemplate = path.join(downloadsDir, `${fileId}.%(ext)s`);
+        command = `yt-dlp -f "${quality}" -o "${outputTemplate}" "${url}"`;
+    }
+    
+    console.log('Đang thực thi lệnh:', command);
+    
+    exec(command, (error, stdout, stderr) => {
+        if (error) {
+            console.error('Lỗi tải xuống:', error);
+            return res.status(500).json({ error: 'Không thể tải video', details: stderr });
+        }
+        
+        console.log('Kết quả:', stdout);
+        
+        // Tìm file đã tải với fileId
+        const files = fs.readdirSync(downloadsDir).filter(file => 
+            file.startsWith(fileId)
+        );
+        
+        if (files.length > 0) {
+            const downloadedFile = files[0];
+            const filePath = path.join(downloadsDir, downloadedFile);
+            const stats = fs.statSync(filePath);
+            
+            // Lên lịch xóa file sau 5 phút
+            scheduleFileCleanup(filePath);
+            
+            // Lấy thông tin video để trả về
+            const getVideoInfoCommand = `yt-dlp --dump-json --no-download "${url}"`;
+            exec(getVideoInfoCommand, (infoError, infoStdout) => {
+                let videoInfo = null;
+                if (!infoError) {
+                    try {
+                        videoInfo = JSON.parse(infoStdout);
+                    } catch (e) {
+                        console.log('Không thể parse thông tin video');
+                    }
+                }
+                
+                res.json({
+                    success: true,
+                    message: 'Tải video thành công',
+                    fileId: fileId,
+                    filename: downloadedFile,
+                    originalTitle: videoInfo?.title || 'Unknown',
+                    size: stats.size,
+                    format: format,
+                    quality: quality,
+                    duration: videoInfo?.duration || null,
+                    thumbnail: videoInfo?.thumbnail || null,
+                    uploader: videoInfo?.uploader || null,
+                    download_url: `/download-file/${downloadedFile}`,
+                    direct_link: `${req.protocol}://${req.get('host')}/download-file/${downloadedFile}`,
+                    expires_in: '5 phút',
+                    created_at: new Date().toISOString()
+                });
+            });
+        } else {
+            res.status(500).json({ error: 'Không tìm thấy file đã tải' });
+        }
+    });
+});
+
+// Route để tải file đã download
+app.get('/download-file/:filename', (req, res) => {
+    const { filename } = req.params;
+    const filePath = path.join(downloadsDir, filename);
+    
+    if (fs.existsSync(filePath)) {
+        res.download(filePath);
+    } else {
+        res.status(404).json({ error: 'File không tồn tại' });
+    }
+});
+
+// Route để liệt kê các file đã tải (bỏ route này)
+// app.get('/downloads', (req, res) => {
+//     const files = fs.readdirSync(downloadsDir).map(filename => {
+//         const filePath = path.join(downloadsDir, filename);
+//         const stats = fs.statSync(filePath);
+//         return {
+//             filename,
+//             size: stats.size,
+//             created: stats.birthtime,
+//             download_url: `/download-file/${filename}`
+//         };
+//     });
+//     
+//     res.json(files);
+// });
+
+// Route để xóa file
+app.delete('/delete/:filename', (req, res) => {
+    const { filename } = req.params;
+    const filePath = path.join(downloadsDir, filename);
+    
+    if (fs.existsSync(filePath)) {
+        fs.unlinkSync(filePath);
+        res.json({ success: true, message: 'Đã xóa file thành công' });
+    } else {
+        res.status(404).json({ error: 'File không tồn tại' });
+    }
+});
+
+// Route kiểm tra trạng thái
+app.get('/status', (req, res) => {
+    exec('yt-dlp --version', (error, stdout, stderr) => {
+        if (error) {
+            res.json({ 
+                status: 'error', 
+                message: 'yt-dlp không được cài đặt hoặc không hoạt động',
+                error: error.message 
+            });
+        } else {
+            res.json({ 
+                status: 'ok', 
+                message: 'API hoạt động bình thường',
+                yt_dlp_version: stdout.trim()
+            });
+        }
+    });
+});
+
+// Route mặc định - redirect to demo
+app.get('/', (req, res) => {
+    res.redirect('/demo.html');
+});
+
+// API info route
+app.get('/api', (req, res) => {
+    res.json({
+        message: 'YouTube Downloader API',
+        version: '2.0.0',
+        endpoints: {
+            'GET /status': 'Kiểm tra trạng thái API',
+            'POST /video-info': 'Lấy thông tin video (body: {url})',
+            'POST /download': 'Tải video (body: {url, format?, quality?})',
+            'GET /downloads': 'Liệt kê các file đã tải',
+            'GET /download-file/:filename': 'Tải file đã download',
+            'DELETE /delete/:filename': 'Xóa file'
+        },
+        demo: 'http://localhost:' + PORT + '/demo.html'
+    });
+});
+
+app.listen(PORT, '0.0.0.0', () => {
+    console.log(`🚀 YouTube Downloader API đang chạy tại http://localhost:${PORT}`);
+    console.log(`📱 Giao diện web: http://localhost:${PORT}`);
+    console.log(`📁 Thư mục tải xuống: ${downloadsDir}`);
+});

config.json

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+{
+  "port": 3000,
+  "downloadsDir": "./downloads",
+  "corsEnabled": true,
+  "defaultQuality": "worst",
+  "supportedFormats": ["video", "audio"],
+  "maxFileSize": "500MB",
+  "allowedOrigins": ["*"],
+  "app": {
+    "name": "YouTube Downloader API",
+    "version": "2.1.0",
+    "description": "API để tải video từ YouTube và các trang web khác sử dụng yt-dlp với video player tích hợp"
+  },
+  "limits": {
+    "maxConcurrentDownloads": 3,
+    "downloadTimeout": 300000
+  },
+  "autoCleanup": {
+    "enabled": true,
+    "fileLifetime": 300000,
+    "description": "File sẽ tự động xóa sau 5 phút (300000ms)"
+  },
+  "features": {
+    "videoPlayer": true,
+    "audioPlayer": true,
+    "directDownload": true,
+    "copyLink": true,
+    "fileIdSystem": true
+  }
+}

demo-old.html

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+<!DOCTYPE html>
+<html lang="vi">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Video Downloader Online - yt-dlp API</title>
+    <script src="https://cdn.tailwindcss.com"></script>
+    <style>
+        @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
+        body { font-family: 'Inter', sans-serif; }
+        .gradient-bg {
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+        }
+        .glass-effect {
+            background: rgba(255, 255, 255, 0.1);
+            backdrop-filter: blur(10px);
+            border: 1px solid rgba(255, 255, 255, 0.2);
+        }
+        .preview-placeholder {
+            background: linear-gradient(45deg, #f0f0f0 25%, transparent 25%), 
+                        linear-gradient(-45deg, #f0f0f0 25%, transparent 25%), 
+                        linear-gradient(45deg, transparent 75%, #f0f0f0 75%), 
+                        linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
+            background-size: 20px 20px;
+            background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
+        }
+        .spinner {
+            animation: spin 1s linear infinite;
+        }
+        @keyframes spin {
+            from { transform: rotate(0deg); }
+            to { transform: rotate(360deg); }
+        }
+    </style>
+</head>
+<body class="gradient-bg min-h-screen">
+    <!-- API Status Indicator -->
+    <div id="apiStatus" class="fixed top-4 right-4 z-50"></div>
+
+    <div class="container mx-auto px-4 py-8">
+        <!-- Header -->
+        <div class="text-center mb-12">
+            <h1 class="text-5xl font-bold text-white mb-4">
+                🎬 Video Downloader
+            </h1>
+            <p class="text-xl text-white/80 max-w-2xl mx-auto">
+                Tải video từ YouTube và các trang web khác sử dụng yt-dlp API
+            </p>
+        </div>
+
+        <!-- Main Content -->
+        <div class="max-w-6xl mx-auto">
+            <div class="grid lg:grid-cols-2 gap-8">
+                <!-- Input Section -->
+                <div class="glass-effect rounded-2xl p-8">
+                    <h2 class="text-2xl font-semibold text-white mb-6 flex items-center">
+                        📥 Nhập Liên Kết
+                    </h2>
+                    
+                    <div class="space-y-6">
+                        <div>
+                            <label class="block text-white/90 text-sm font-medium mb-3">
+                                URL Video
+                            </label>
+                            <input 
+                                type="url" 
+                                id="videoUrl"
+                                placeholder="https://www.youtube.com/watch?v=dQw4w9WgXcQ"
+                                value="https://www.youtube.com/watch?v=dQw4w9WgXcQ"
+                                class="w-full px-4 py-3 rounded-xl bg-white/10 border border-white/20 text-white placeholder-white/50 focus:outline-none focus:ring-2 focus:ring-blue-400 focus:border-transparent transition-all"
+                            >
+                        </div>
+
+                        <div>
+                            <label class="block text-white/90 text-sm font-medium mb-3">
+                                Chất Lượng
+                            </label>
+                            <select id="qualitySelect" class="w-full px-4 py-3 rounded-xl bg-white/10 border border-white/20 text-white focus:outline-none focus:ring-2 focus:ring-blue-400 focus:border-transparent transition-all">
+                                <option value="best" class="bg-gray-800">Tốt nhất</option>
+                                <option value="worst" class="bg-gray-800">Thấp nhất (nhanh hơn)</option>
+                                <option value="720p" class="bg-gray-800">720p (HD)</option>
+                                <option value="480p" class="bg-gray-800">480p (SD)</option>
+                                <option value="360p" class="bg-gray-800">360p</option>
+                            </select>
+                        </div>
+
+                        <div>
+                            <label class="block text-white/90 text-sm font-medium mb-3">
+                                Định Dạng
+                            </label>
+                            <div class="flex gap-3">
+                                <label class="flex items-center cursor-pointer">
+                                    <input type="radio" name="format" value="video" checked class="sr-only">
+                                    <div class="w-5 h-5 rounded-full border-2 border-white/40 flex items-center justify-center mr-2">
+                                        <div class="w-2 h-2 rounded-full bg-blue-400"></div>
+                                    </div>
+                                    <span class="text-white/90">Video</span>
+                                </label>
+                                <label class="flex items-center cursor-pointer">
+                                    <input type="radio" name="format" value="audio" class="sr-only">
+                                    <div class="w-5 h-5 rounded-full border-2 border-white/40 flex items-center justify-center mr-2">
+                                        <div class="w-2 h-2 rounded-full bg-transparent"></div>
+                                    </div>
+                                    <span class="text-white/90">Audio MP3</span>
+                                </label>
+                            </div>
+                        </div>
+
+                        <div class="flex gap-3">
+                            <button 
+                                onclick="getVideoInfo()"
+                                class="flex-1 bg-gradient-to-r from-green-500 to-teal-600 hover:from-green-600 hover:to-teal-700 text-white font-semibold py-4 px-6 rounded-xl transition-all duration-300 transform hover:scale-105 shadow-lg"
+                            >
+                                🔍 Xem Thông Tin
+                            </button>
+                            <button 
+                                onclick="downloadVideo()"
+                                class="flex-1 bg-gradient-to-r from-blue-500 to-purple-600 hover:from-blue-600 hover:to-purple-700 text-white font-semibold py-4 px-6 rounded-xl transition-all duration-300 transform hover:scale-105 shadow-lg"
+                            >
+                                🚀 Tải Xuống
+                            </button>
+                        </div>
+                    </div>
+                </div>
+
+                <!-- Preview Section -->
+                <div class="glass-effect rounded-2xl p-8">
+                    <h2 class="text-2xl font-semibold text-white mb-6 flex items-center">
+                        👁️ Thông Tin Video
+                    </h2>
+                    
+                    <div id="previewContainer" class="space-y-4">
+                        <div class="preview-placeholder rounded-xl h-48 flex items-center justify-center">
+                            <div class="text-center text-gray-500">
+                                <div class="text-4xl mb-2">🎥</div>
+                                <p>Nhấn "Xem Thông Tin" để hiển thị chi tiết video</p>
+                            </div>
+                        </div>
+                        
+                        <div class="bg-white/5 rounded-xl p-4">
+                            <h3 id="videoTitle" class="text-white font-medium mb-2">Tiêu đề video sẽ hiển thị ở đây</h3>
+                            <div class="flex justify-between text-sm text-white/70">
+                                <span id="videoDuration">Thời lượng: --:--</span>
+                                <span id="videoViews">Lượt xem: --</span>
+                            </div>
+                            <div class="mt-2 text-sm text-white/70">
+                                <span id="videoUploader">Kênh: --</span>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+
+            <!-- Output Section -->
+            <div class="glass-effect rounded-2xl p-8 mt-8">
+                <h2 class="text-2xl font-semibold text-white mb-6 flex items-center">
+                    📤 Kết Quả Tải Xuống
+                </h2>
+                
+                <div id="outputContainer" class="space-y-4">
+                    <div class="bg-white/5 rounded-xl p-6 text-center">
+                        <div class="text-4xl mb-4">⏳</div>
+                        <p class="text-white/70">Chưa có video nào được xử lý</p>
+                        <p class="text-sm text-white/50 mt-2">Nhập URL và nhấn "Tải Xuống" để bắt đầu</p>
+                    </div>
+                </div>
+            </div>
+
+            <!-- Downloaded Files Section -->
+            <div class="glass-effect rounded-2xl p-8 mt-8">
+                <div class="flex items-center justify-between mb-6">
+                    <h2 class="text-2xl font-semibold text-white flex items-center">
+                        📁 File Đã Tải
+                    </h2>
+                    <button 
+                        onclick="refreshDownloadsList()"
+                        class="bg-white/10 hover:bg-white/20 text-white px-4 py-2 rounded-lg transition-colors text-sm"
+                    >
+                        🔄 Làm mới
+                    </button>
+                </div>
+                
+                <div id="downloadsContainer">
+                    <div class="bg-white/5 rounded-xl p-6 text-center">
+                        <div class="text-4xl mb-4">�</div>
+                        <p class="text-white/70">Đang tải danh sách file...</p>
+                    </div>
+                </div>
+            </div>
+
+            <!-- Supported Sites -->
+            <div class="glass-effect rounded-2xl p-8 mt-8">
+                <h2 class="text-2xl font-semibold text-white mb-6 text-center">
+                    🌐 Trang Web Được Hỗ Trợ (yt-dlp)
+                </h2>
+                <div class="grid grid-cols-2 md:grid-cols-4 lg:grid-cols-6 gap-4">
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">📺</div>
+                        <span class="text-white/80 text-sm">YouTube</span>
+                    </div>
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">📱</div>
+                        <span class="text-white/80 text-sm">TikTok</span>
+                    </div>
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">📘</div>
+                        <span class="text-white/80 text-sm">Facebook</span>
+                    </div>
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">📷</div>
+                        <span class="text-white/80 text-sm">Instagram</span>
+                    </div>
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">�</div>
+                        <span class="text-white/80 text-sm">Twitter</span>
+                    </div>
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">🎵</div>
+                        <span class="text-white/80 text-sm">Vimeo</span>
+                    </div>
+                </div>
+                <div class="text-center mt-4">
+                    <p class="text-white/60 text-sm">và hàng nghìn trang web khác được hỗ trợ bởi yt-dlp</p>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <script>
+        const API_BASE = 'http://localhost:3000';
+        let currentVideoInfo = null;
+
+        // Handle radio button visual feedback
+        document.querySelectorAll('input[name="format"]').forEach(radio => {
+            radio.addEventListener('change', function() {
+                document.querySelectorAll('input[name="format"]').forEach(r => {
+                    const circle = r.parentElement.querySelector('div div');
+                    if (r.checked) {
+                        circle.classList.add('bg-blue-400');
+                        circle.classList.remove('bg-transparent');
+                    } else {
+                        circle.classList.remove('bg-blue-400');
+                        circle.classList.add('bg-transparent');
+                    }
+                });
+            });
+        });
+
+        // Show API status indicator
+        function showApiStatus(status, message) {
+            const statusDiv = document.getElementById('apiStatus');
+            const statusClass = status === 'ok' ? 'bg-green-500' : status === 'loading' ? 'bg-yellow-500' : 'bg-red-500';
+            statusDiv.innerHTML = `
+                <div class="${statusClass} text-white px-4 py-2 rounded-lg shadow-lg flex items-center">
+                    <div class="mr-2">${status === 'ok' ? '✅' : status === 'loading' ? '⏳' : '❌'}</div>
+                    <span class="text-sm">${message}</span>
+                </div>
+            `;
+        }
+
+        // Check API status on load
+        async function checkApiStatus() {
+            showApiStatus('loading', 'Đang kiểm tra API...');
+            try {
+                const response = await fetch(`${API_BASE}/status`);
+                const data = await response.json();
+                if (data.status === 'ok') {
+                    showApiStatus('ok', `API sẵn sàng - yt-dlp ${data.yt_dlp_version}`);
+                } else {
+                    showApiStatus('error', 'API có lỗi');
+                }
+            } catch (error) {
+                showApiStatus('error', 'Không thể kết nối API');
+            }
+        }
+
+        // Get video information
+        async function getVideoInfo() {
+            const url = document.getElementById('videoUrl').value.trim();
+            if (!url) {
+                alert('Vui lòng nhập URL video!');
+                return;
+            }
+
+            // Show loading state
+            const previewContainer = document.getElementById('previewContainer');
+            previewContainer.innerHTML = `
+                <div class="bg-gray-800 rounded-xl h-48 flex items-center justify-center">
+                    <div class="text-center text-white">
+                        <div class="text-4xl mb-4 spinner">⚙️</div>
+                        <p>Đang lấy thông tin video...</p>
+                    </div>
+                </div>
+                <div class="bg-white/5 rounded-xl p-4">
+                    <div class="animate-pulse">
+                        <div class="h-4 bg-white/20 rounded mb-2"></div>
+                        <div class="h-3 bg-white/10 rounded"></div>
+                    </div>
+                </div>
+            `;
+
+            try {
+                const response = await fetch(`${API_BASE}/video-info`, {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({ url })
+                });
+
+                const data = await response.json();
+
+                if (response.ok) {
+                    currentVideoInfo = data;
+                    updatePreview(data);
+                } else {
+                    showError(data.error || 'Không thể lấy thông tin video');
+                }
+            } catch (error) {
+                showError(`Lỗi kết nối: ${error.message}`);
+            }
+        }
+
+        // Update preview with video info
+        function updatePreview(videoInfo) {
+            const duration = videoInfo.duration ? 
+                `${Math.floor(videoInfo.duration / 60)}:${(videoInfo.duration % 60).toString().padStart(2, '0')}` : 
+                'N/A';
+            
+            const views = videoInfo.view_count ? 
+                videoInfo.view_count.toLocaleString('vi-VN') : 
+                'N/A';
+
+            document.getElementById('previewContainer').innerHTML = `
+                <div class="bg-gray-800 rounded-xl h-48 flex items-center justify-center relative overflow-hidden">
+                    ${videoInfo.thumbnail ? 
+                        `<img src="${videoInfo.thumbnail}" alt="Thumbnail" class="w-full h-full object-cover rounded-xl">` :
+                        `<div class="text-center text-white">
+                            <div class="text-6xl mb-2">🎬</div>
+                            <p class="text-sm opacity-75">Video Preview</p>
+                        </div>`
+                    }
+                    <div class="absolute inset-0 bg-black/20 rounded-xl"></div>
+                    <div class="absolute bottom-4 right-4 bg-black/70 text-white px-2 py-1 rounded text-sm">
+                        ${duration}
+                    </div>
+                </div>
+                <div class="bg-white/5 rounded-xl p-4">
+                    <h3 class="text-white font-medium mb-2">${videoInfo.title || 'Không có tiêu đề'}</h3>
+                    <div class="flex justify-between text-sm text-white/70">
+                        <span>Thời lượng: ${duration}</span>
+                        <span>Lượt xem: ${views}</span>
+                    </div>
+                    <div class="mt-2 text-sm text-white/70">
+                        <span>Kênh: ${videoInfo.uploader || 'N/A'}</span>
+                    </div>
+                    <div class="mt-2 text-xs text-white/50">
+                        ${videoInfo.formats?.length || 0} định dạng có sẵn
+                    </div>
+                </div>
+            `;
+        }
+
+        // Download video
+        async function downloadVideo() {
+            const url = document.getElementById('videoUrl').value.trim();
+            const quality = document.getElementById('qualitySelect').value;
+            const format = document.querySelector('input[name="format"]:checked').value;
+            
+            if (!url) {
+                alert('Vui lòng nhập URL video!');
+                return;
+            }
+
+            // Show loading state
+            const outputContainer = document.getElementById('outputContainer');
+            outputContainer.innerHTML = `
+                <div class="bg-blue-500/10 border border-blue-500/30 rounded-xl p-6 text-center">
+                    <div class="text-4xl mb-4 spinner">⚙️</div>
+                    <p class="text-white mb-2">Đang tải video...</p>
+                    <p class="text-white/70 text-sm">Chất lượng: ${quality} | Định dạng: ${format === 'audio' ? 'MP3' : 'Video'}</p>
+                    <div class="w-full bg-white/10 rounded-full h-2 mt-4">
+                        <div class="bg-blue-500 h-2 rounded-full animate-pulse" style="width: 60%"></div>
+                    </div>
+                    <p class="text-white/60 text-xs mt-2">Thời gian tải phụ thuộc vào kích thước và chất lượng video</p>
+                </div>
+            `;
+
+            try {
+                const response = await fetch(`${API_BASE}/download`, {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({ url, format, quality })
+                });
+
+                const data = await response.json();
+
+                if (response.ok) {
+                    showDownloadSuccess(data);
+                    refreshDownloadsList();
+                } else {
+                    showError(data.error || 'Không thể tải video');
+                }
+            } catch (error) {
+                showError(`Lỗi kết nối: ${error.message}`);
+            }
+        }
+
+        // Show download success
+        function showDownloadSuccess(data) {
+            const outputContainer = document.getElementById('outputContainer');
+            outputContainer.innerHTML = `
+                <div class="bg-green-500/10 border border-green-500/30 rounded-xl p-6">
+                    <div class="flex items-center justify-between mb-4">
+                        <div class="flex items-center">
+                            <div class="text-2xl mr-3">✅</div>
+                            <div>
+                                <h3 class="text-white font-medium">Tải xuống thành công!</h3>
+                                <p class="text-white/70 text-sm">${data.message}</p>
+                            </div>
+                        </div>
+                    </div>
+                    
+                    <div class="bg-white/5 rounded-lg p-4 mb-4">
+                        <div class="flex justify-between items-center">
+                            <div>
+                                <p class="text-white font-medium">${data.filename}</p>
+                                <p class="text-white/70 text-sm">File đã được lưu trên server</p>
+                            </div>
+                            <a href="${API_BASE}${data.download_url}" 
+                               target="_blank"
+                               class="bg-blue-500 hover:bg-blue-600 text-white px-6 py-2 rounded-lg transition-colors">
+                                📥 Tải về máy
+                            </a>
+                        </div>
+                    </div>
+                    
+                    <div class="text-center">
+                        <p class="text-white/60 text-sm">
+                            💡 File sẽ được lưu trên server và có thể tải về từ danh sách "File Đã Tải"
+                        </p>
+                    </div>
+                </div>
+            `;
+        }
+
+        // Show error
+        function showError(message) {
+            const outputContainer = document.getElementById('outputContainer');
+            outputContainer.innerHTML = `
+                <div class="bg-red-500/10 border border-red-500/30 rounded-xl p-6 text-center">
+                    <div class="text-4xl mb-4">❌</div>
+                    <p class="text-white mb-2">Có lỗi xảy ra</p>
+                    <p class="text-red-300 text-sm">${message}</p>
+                    <button onclick="checkApiStatus()" class="mt-4 bg-red-500 hover:bg-red-600 text-white px-4 py-2 rounded-lg transition-colors text-sm">
+                        🔄 Kiểm tra lại API
+                    </button>
+                </div>
+            `;
+        }
+
+        // Refresh downloads list
+        async function refreshDownloadsList() {
+            const container = document.getElementById('downloadsContainer');
+            container.innerHTML = `
+                <div class="bg-white/5 rounded-xl p-6 text-center">
+                    <div class="text-4xl mb-4 spinner">⚙️</div>
+                    <p class="text-white/70">Đang tải danh sách file...</p>
+                </div>
+            `;
+
+            try {
+                const response = await fetch(`${API_BASE}/downloads`);
+                const files = await response.json();
+
+                if (files.length === 0) {
+                    container.innerHTML = `
+                        <div class="bg-white/5 rounded-xl p-6 text-center">
+                            <div class="text-4xl mb-4">📂</div>
+                            <p class="text-white/70">Chưa có file nào được tải về</p>
+                            <p class="text-white/50 text-sm mt-2">Tải video để xem danh sách ở đây</p>
+                        </div>
+                    `;
+                } else {
+                    let filesHTML = '<div class="space-y-3">';
+                    files.forEach((file, index) => {
+                        const size = (file.size / (1024 * 1024)).toFixed(2);
+                        const date = new Date(file.created).toLocaleString('vi-VN');
+                        filesHTML += `
+                            <div class="bg-white/5 rounded-lg p-4">
+                                <div class="flex justify-between items-center">
+                                    <div class="flex-1">
+                                        <h4 class="text-white font-medium text-sm mb-1">${file.filename}</h4>
+                                        <div class="text-white/70 text-xs">
+                                            <span>${size} MB</span> • 
+                                            <span>${date}</span>
+                                        </div>
+                                    </div>
+                                    <div class="flex gap-2 ml-4">
+                                        <a href="${API_BASE}${file.download_url}" 
+                                           target="_blank"
+                                           class="bg-blue-500 hover:bg-blue-600 text-white px-3 py-1 rounded text-xs transition-colors">
+                                            📥 Tải
+                                        </a>
+                                        <button onclick="deleteFile('${file.filename}')"
+                                                class="bg-red-500 hover:bg-red-600 text-white px-3 py-1 rounded text-xs transition-colors">
+                                            🗑️ Xóa
+                                        </button>
+                                    </div>
+                                </div>
+                            </div>
+                        `;
+                    });
+                    filesHTML += '</div>';
+                    container.innerHTML = filesHTML;
+                }
+            } catch (error) {
+                container.innerHTML = `
+                    <div class="bg-red-500/10 border border-red-500/30 rounded-xl p-6 text-center">
+                        <div class="text-4xl mb-4">❌</div>
+                        <p class="text-white/70">Không thể tải danh sách file</p>
+                        <p class="text-red-300 text-sm">${error.message}</p>
+                    </div>
+                `;
+            }
+        }
+
+        // Delete file
+        async function deleteFile(filename) {
+            if (!confirm(`Bạn có chắc muốn xóa file "${filename}"?`)) {
+                return;
+            }
+
+            try {
+                const response = await fetch(`${API_BASE}/delete/${encodeURIComponent(filename)}`, {
+                    method: 'DELETE'
+                });
+                
+                if (response.ok) {
+                    refreshDownloadsList();
+                } else {
+                    const data = await response.json();
+                    alert(`Lỗi: ${data.error}`);
+                }
+            } catch (error) {
+                alert(`Lỗi kết nối: ${error.message}`);
+            }
+        }
+
+        // Initialize app
+        window.onload = function() {
+            checkApiStatus();
+            refreshDownloadsList();
+            document.getElementById('videoUrl').focus();
+        };
+    </script>
+</body>
+</html>

demo.html

@@ -0,0 +1,500 @@
+<!DOCTYPE html>
+<html lang="vi">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Video Downloader Online - yt-dlp API</title>
+    <script src="https://cdn.tailwindcss.com"></script>
+    <style>
+        @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
+        body { font-family: 'Inter', sans-serif; }
+        .gradient-bg {
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+        }
+        .glass-effect {
+            background: rgba(255, 255, 255, 0.1);
+            backdrop-filter: blur(10px);
+            border: 1px solid rgba(255, 255, 255, 0.2);
+        }
+        .preview-placeholder {
+            background: linear-gradient(45deg, #f0f0f0 25%, transparent 25%), 
+                        linear-gradient(-45deg, #f0f0f0 25%, transparent 25%), 
+                        linear-gradient(45deg, transparent 75%, #f0f0f0 75%), 
+                        linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
+            background-size: 20px 20px;
+            background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
+        }
+        .spinner {
+            animation: spin 1s linear infinite;
+        }
+        @keyframes spin {
+            from { transform: rotate(0deg); }
+            to { transform: rotate(360deg); }
+        }
+        video {
+            max-width: 100%;
+            height: auto;
+        }
+    </style>
+</head>
+<body class="gradient-bg min-h-screen">
+    <!-- API Status Indicator -->
+    <div id="apiStatus" class="fixed top-4 right-4 z-50"></div>
+
+    <div class="container mx-auto px-4 py-8">
+        <!-- Header -->
+        <div class="text-center mb-12">
+            <h1 class="text-5xl font-bold text-white mb-4">
+                🎬 Video Downloader
+            </h1>
+            <p class="text-xl text-white/80 max-w-2xl mx-auto">
+                Tải video từ YouTube và các trang web khác sử dụng yt-dlp API
+            </p>
+        </div>
+
+        <!-- Main Content -->
+        <div class="max-w-6xl mx-auto">
+            <div class="grid lg:grid-cols-2 gap-8">
+                <!-- Input Section -->
+                <div class="glass-effect rounded-2xl p-8">
+                    <h2 class="text-2xl font-semibold text-white mb-6 flex items-center">
+                        📥 Nhập Liên Kết
+                    </h2>
+                    
+                    <div class="space-y-6">
+                        <div>
+                            <label class="block text-white/90 text-sm font-medium mb-3">
+                                URL Video
+                            </label>
+                            <input 
+                                type="url" 
+                                id="videoUrl"
+                                placeholder="https://www.youtube.com/watch?v=dQw4w9WgXcQ"
+                                value="https://www.youtube.com/watch?v=dQw4w9WgXcQ"
+                                class="w-full px-4 py-3 rounded-xl bg-white/10 border border-white/20 text-white placeholder-white/50 focus:outline-none focus:ring-2 focus:ring-blue-400 focus:border-transparent transition-all"
+                            >
+                        </div>
+
+                        <div>
+                            <label class="block text-white/90 text-sm font-medium mb-3">
+                                Chất Lượng
+                            </label>
+                            <select id="qualitySelect" class="w-full px-4 py-3 rounded-xl bg-white/10 border border-white/20 text-white focus:outline-none focus:ring-2 focus:ring-blue-400 focus:border-transparent transition-all">
+                                <option value="best" class="bg-gray-800">Tốt nhất</option>
+                                <option value="worst" class="bg-gray-800">Thấp nhất (nhanh hơn)</option>
+                                <option value="720p" class="bg-gray-800">720p (HD)</option>
+                                <option value="480p" class="bg-gray-800">480p (SD)</option>
+                                <option value="360p" class="bg-gray-800">360p</option>
+                            </select>
+                        </div>
+
+                        <div>
+                            <label class="block text-white/90 text-sm font-medium mb-3">
+                                Định Dạng
+                            </label>
+                            <div class="flex gap-3">
+                                <label class="flex items-center cursor-pointer">
+                                    <input type="radio" name="format" value="video" checked class="sr-only">
+                                    <div class="w-5 h-5 rounded-full border-2 border-white/40 flex items-center justify-center mr-2">
+                                        <div class="w-2 h-2 rounded-full bg-blue-400"></div>
+                                    </div>
+                                    <span class="text-white/90">Video</span>
+                                </label>
+                                <label class="flex items-center cursor-pointer">
+                                    <input type="radio" name="format" value="audio" class="sr-only">
+                                    <div class="w-5 h-5 rounded-full border-2 border-white/40 flex items-center justify-center mr-2">
+                                        <div class="w-2 h-2 rounded-full bg-transparent"></div>
+                                    </div>
+                                    <span class="text-white/90">Audio MP3</span>
+                                </label>
+                            </div>
+                        </div>
+
+                        <div class="flex gap-3">
+                            <button 
+                                onclick="getVideoInfo()"
+                                class="flex-1 bg-gradient-to-r from-green-500 to-teal-600 hover:from-green-600 hover:to-teal-700 text-white font-semibold py-4 px-6 rounded-xl transition-all duration-300 transform hover:scale-105 shadow-lg"
+                            >
+                                🔍 Xem Thông Tin
+                            </button>
+                            <button 
+                                onclick="downloadVideo()"
+                                class="flex-1 bg-gradient-to-r from-blue-500 to-purple-600 hover:from-blue-600 hover:to-purple-700 text-white font-semibold py-4 px-6 rounded-xl transition-all duration-300 transform hover:scale-105 shadow-lg"
+                            >
+                                🚀 Tải Xuống
+                            </button>
+                        </div>
+                    </div>
+                </div>
+
+                <!-- Preview Section -->
+                <div class="glass-effect rounded-2xl p-8">
+                    <h2 class="text-2xl font-semibold text-white mb-6 flex items-center">
+                        👁️ Thông Tin Video
+                    </h2>
+                    
+                    <div id="previewContainer" class="space-y-4">
+                        <div class="preview-placeholder rounded-xl h-48 flex items-center justify-center">
+                            <div class="text-center text-gray-500">
+                                <div class="text-4xl mb-2">🎥</div>
+                                <p>Nhấn "Xem Thông Tin" để hiển thị chi tiết video</p>
+                            </div>
+                        </div>
+                        
+                        <div class="bg-white/5 rounded-xl p-4">
+                            <h3 id="videoTitle" class="text-white font-medium mb-2">Tiêu đề video sẽ hiển thị ở đây</h3>
+                            <div class="flex justify-between text-sm text-white/70">
+                                <span id="videoDuration">Thời lượng: --:--</span>
+                                <span id="videoViews">Lượt xem: --</span>
+                            </div>
+                            <div class="mt-2 text-sm text-white/70">
+                                <span id="videoUploader">Kênh: --</span>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+
+            <!-- Output Section -->
+            <div class="glass-effect rounded-2xl p-8 mt-8">
+                <h2 class="text-2xl font-semibold text-white mb-6 flex items-center">
+                    📤 Kết Quả Tải Xuống
+                </h2>
+                
+                <div id="outputContainer" class="space-y-4">
+                    <div class="bg-white/5 rounded-xl p-6 text-center">
+                        <div class="text-4xl mb-4">⏳</div>
+                        <p class="text-white/70">Chưa có video nào được xử lý</p>
+                        <p class="text-sm text-white/50 mt-2">Nhập URL và nhấn "Tải Xuống" để bắt đầu</p>
+                    </div>
+                </div>
+            </div>
+
+            <!-- Supported Sites -->
+            <div class="glass-effect rounded-2xl p-8 mt-8">
+                <h2 class="text-2xl font-semibold text-white mb-6 text-center">
+                    🌐 Trang Web Được Hỗ Trợ (yt-dlp)
+                </h2>
+                <div class="grid grid-cols-2 md:grid-cols-4 lg:grid-cols-6 gap-4">
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">📺</div>
+                        <span class="text-white/80 text-sm">YouTube</span>
+                    </div>
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">📱</div>
+                        <span class="text-white/80 text-sm">TikTok</span>
+                    </div>
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">📘</div>
+                        <span class="text-white/80 text-sm">Facebook</span>
+                    </div>
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">📷</div>
+                        <span class="text-white/80 text-sm">Instagram</span>
+                    </div>
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">🐦</div>
+                        <span class="text-white/80 text-sm">Twitter</span>
+                    </div>
+                    <div class="bg-white/10 rounded-lg p-4 text-center">
+                        <div class="text-2xl mb-2">🎵</div>
+                        <span class="text-white/80 text-sm">Vimeo</span>
+                    </div>
+                </div>
+                <div class="text-center mt-4">
+                    <p class="text-white/60 text-sm">và hàng nghìn trang web khác được hỗ trợ bởi yt-dlp</p>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <script>
+        // Auto-detect API base URL
+        const API_BASE = window.location.origin;
+        let currentVideoInfo = null;
+
+        // Handle radio button visual feedback
+        document.querySelectorAll('input[name="format"]').forEach(radio => {
+            radio.addEventListener('change', function() {
+                document.querySelectorAll('input[name="format"]').forEach(r => {
+                    const circle = r.parentElement.querySelector('div div');
+                    if (r.checked) {
+                        circle.classList.add('bg-blue-400');
+                        circle.classList.remove('bg-transparent');
+                    } else {
+                        circle.classList.remove('bg-blue-400');
+                        circle.classList.add('bg-transparent');
+                    }
+                });
+            });
+        });
+
+        // Show API status indicator
+        function showApiStatus(status, message) {
+            const statusDiv = document.getElementById('apiStatus');
+            const statusClass = status === 'ok' ? 'bg-green-500' : status === 'loading' ? 'bg-yellow-500' : 'bg-red-500';
+            statusDiv.innerHTML = `
+                <div class="${statusClass} text-white px-4 py-2 rounded-lg shadow-lg flex items-center">
+                    <div class="mr-2">${status === 'ok' ? '✅' : status === 'loading' ? '⏳' : '❌'}</div>
+                    <span class="text-sm">${message}</span>
+                </div>
+            `;
+        }
+
+        // Check API status on load
+        async function checkApiStatus() {
+            showApiStatus('loading', 'Đang kiểm tra API...');
+            try {
+                const response = await fetch(`${API_BASE}/status`);
+                const data = await response.json();
+                if (data.status === 'ok') {
+                    showApiStatus('ok', `API sẵn sàng - yt-dlp ${data.yt_dlp_version}`);
+                } else {
+                    showApiStatus('error', 'API có lỗi');
+                }
+            } catch (error) {
+                showApiStatus('error', 'Không thể kết nối API');
+            }
+        }
+
+        // Get video information
+        async function getVideoInfo() {
+            const url = document.getElementById('videoUrl').value.trim();
+            if (!url) {
+                alert('Vui lòng nhập URL video!');
+                return;
+            }
+
+            // Show loading state
+            const previewContainer = document.getElementById('previewContainer');
+            previewContainer.innerHTML = `
+                <div class="bg-gray-800 rounded-xl h-48 flex items-center justify-center">
+                    <div class="text-center text-white">
+                        <div class="text-4xl mb-4 spinner">⚙️</div>
+                        <p>Đang lấy thông tin video...</p>
+                    </div>
+                </div>
+                <div class="bg-white/5 rounded-xl p-4">
+                    <div class="animate-pulse">
+                        <div class="h-4 bg-white/20 rounded mb-2"></div>
+                        <div class="h-3 bg-white/10 rounded"></div>
+                    </div>
+                </div>
+            `;
+
+            try {
+                const response = await fetch(`${API_BASE}/video-info`, {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({ url })
+                });
+
+                const data = await response.json();
+
+                if (response.ok) {
+                    currentVideoInfo = data;
+                    updatePreview(data);
+                } else {
+                    showError(data.error || 'Không thể lấy thông tin video');
+                }
+            } catch (error) {
+                showError(`Lỗi kết nối: ${error.message}`);
+            }
+        }
+
+        // Update preview with video info
+        function updatePreview(videoInfo) {
+            const duration = videoInfo.duration ? 
+                `${Math.floor(videoInfo.duration / 60)}:${(videoInfo.duration % 60).toString().padStart(2, '0')}` : 
+                'N/A';
+            
+            const views = videoInfo.view_count ? 
+                videoInfo.view_count.toLocaleString('vi-VN') : 
+                'N/A';
+
+            document.getElementById('previewContainer').innerHTML = `
+                <div class="bg-gray-800 rounded-xl h-48 flex items-center justify-center relative overflow-hidden">
+                    ${videoInfo.thumbnail ? 
+                        `<img src="${videoInfo.thumbnail}" alt="Thumbnail" class="w-full h-full object-cover rounded-xl">` :
+                        `<div class="text-center text-white">
+                            <div class="text-6xl mb-2">🎬</div>
+                            <p class="text-sm opacity-75">Video Preview</p>
+                        </div>`
+                    }
+                    <div class="absolute inset-0 bg-black/20 rounded-xl"></div>
+                    <div class="absolute bottom-4 right-4 bg-black/70 text-white px-2 py-1 rounded text-sm">
+                        ${duration}
+                    </div>
+                </div>
+                <div class="bg-white/5 rounded-xl p-4">
+                    <h3 class="text-white font-medium mb-2">${videoInfo.title || 'Không có tiêu đề'}</h3>
+                    <div class="flex justify-between text-sm text-white/70">
+                        <span>Thời lượng: ${duration}</span>
+                        <span>Lượt xem: ${views}</span>
+                    </div>
+                    <div class="mt-2 text-sm text-white/70">
+                        <span>Kênh: ${videoInfo.uploader || 'N/A'}</span>
+                    </div>
+                    <div class="mt-2 text-xs text-white/50">
+                        ${videoInfo.formats?.length || 0} định dạng có sẵn
+                    </div>
+                </div>
+            `;
+        }
+
+        // Download video
+        async function downloadVideo() {
+            const url = document.getElementById('videoUrl').value.trim();
+            const quality = document.getElementById('qualitySelect').value;
+            const format = document.querySelector('input[name="format"]:checked').value;
+            
+            if (!url) {
+                alert('Vui lòng nhập URL video!');
+                return;
+            }
+
+            // Show loading state
+            const outputContainer = document.getElementById('outputContainer');
+            outputContainer.innerHTML = `
+                <div class="bg-blue-500/10 border border-blue-500/30 rounded-xl p-6 text-center">
+                    <div class="text-4xl mb-4 spinner">⚙️</div>
+                    <p class="text-white mb-2">Đang tải video...</p>
+                    <p class="text-white/70 text-sm">Chất lượng: ${quality} | Định dạng: ${format === 'audio' ? 'MP3' : 'Video'}</p>
+                    <div class="w-full bg-white/10 rounded-full h-2 mt-4">
+                        <div class="bg-blue-500 h-2 rounded-full animate-pulse" style="width: 60%"></div>
+                    </div>
+                    <p class="text-white/60 text-xs mt-2">Thời gian tải phụ thuộc vào kích thước và chất lượng video</p>
+                </div>
+            `;
+
+            try {
+                const response = await fetch(`${API_BASE}/download`, {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({ url, format, quality })
+                });
+
+                const data = await response.json();
+
+                if (response.ok) {
+                    showDownloadSuccess(data);
+                } else {
+                    showError(data.error || 'Không thể tải video');
+                }
+            } catch (error) {
+                showError(`Lỗi kết nối: ${error.message}`);
+            }
+        }
+
+        // Show download success with video player
+        function showDownloadSuccess(data) {
+            const outputContainer = document.getElementById('outputContainer');
+            const isVideo = data.format === 'video';
+            const fileSize = (data.size / (1024 * 1024)).toFixed(2);
+            
+            outputContainer.innerHTML = `
+                <div class="bg-green-500/10 border border-green-500/30 rounded-xl p-6">
+                    <div class="flex items-center justify-between mb-4">
+                        <div class="flex items-center">
+                            <div class="text-2xl mr-3">✅</div>
+                            <div>
+                                <h3 class="text-white font-medium">Tải xuống thành công!</h3>
+                                <p class="text-white/70 text-sm">${data.originalTitle}</p>
+                            </div>
+                        </div>
+                    </div>
+                    
+                    ${isVideo ? `
+                    <div class="bg-black rounded-xl p-4 mb-4">
+                        <video controls class="w-full rounded-lg" poster="${data.thumbnail || ''}">
+                            <source src="${data.direct_link}" type="video/mp4">
+                            Trình duyệt của bạn không hỗ trợ video HTML5.
+                        </video>
+                    </div>
+                    ` : `
+                    <div class="bg-black/20 rounded-xl p-4 mb-4 flex items-center justify-center">
+                        <div class="text-center text-white">
+                            <div class="text-6xl mb-2">🎵</div>
+                            <p class="text-lg font-medium">Audio MP3</p>
+                            <audio controls class="mt-4">
+                                <source src="${data.direct_link}" type="audio/mpeg">
+                                Trình duyệt của bạn không hỗ trợ audio HTML5.
+                            </audio>
+                        </div>
+                    </div>
+                    `}
+                    
+                    <div class="bg-white/5 rounded-lg p-4 mb-4">
+                        <div class="grid grid-cols-2 md:grid-cols-4 gap-4 text-sm text-white/70">
+                            <div>
+                                <span class="block font-medium text-white">ID File:</span>
+                                ${data.fileId}
+                            </div>
+                            <div>
+                                <span class="block font-medium text-white">Kích thước:</span>
+                                ${fileSize} MB
+                            </div>
+                            <div>
+                                <span class="block font-medium text-white">Định dạng:</span>
+                                ${data.format === 'audio' ? 'MP3' : 'MP4'}
+                            </div>
+                            <div>
+                                <span class="block font-medium text-white">Thời gian xóa:</span>
+                                ${data.expires_in}
+                            </div>
+                        </div>
+                    </div>
+                    
+                    <div class="flex gap-3">
+                        <a href="${data.direct_link}" 
+                           download="${data.filename}"
+                           class="flex-1 bg-blue-500 hover:bg-blue-600 text-white px-6 py-3 rounded-lg transition-colors text-center font-medium">
+                            📥 Tải về máy
+                        </a>
+                        <button onclick="copyLink('${data.direct_link}')"
+                                class="flex-1 bg-purple-500 hover:bg-purple-600 text-white px-6 py-3 rounded-lg transition-colors font-medium">
+                            🔗 Copy Link
+                        </button>
+                    </div>
+                    
+                    <div class="text-center mt-4">
+                        <p class="text-white/60 text-sm">
+                            ⚠️ File sẽ tự động xóa sau ${data.expires_in} kể từ khi tải xuống
+                        </p>
+                    </div>
+                </div>
+            `;
+        }
+
+        // Copy link to clipboard
+        function copyLink(link) {
+            navigator.clipboard.writeText(link).then(() => {
+                alert('Link đã được copy vào clipboard!');
+            }).catch(() => {
+                alert('Không thể copy link. Hãy copy thủ công: ' + link);
+            });
+        }
+
+        // Show error
+        function showError(message) {
+            const outputContainer = document.getElementById('outputContainer');
+            outputContainer.innerHTML = `
+                <div class="bg-red-500/10 border border-red-500/30 rounded-xl p-6 text-center">
+                    <div class="text-4xl mb-4">❌</div>
+                    <p class="text-white mb-2">Có lỗi xảy ra</p>
+                    <p class="text-red-300 text-sm">${message}</p>
+                    <button onclick="checkApiStatus()" class="mt-4 bg-red-500 hover:bg-red-600 text-white px-4 py-2 rounded-lg transition-colors text-sm">
+                        🔄 Kiểm tra lại API
+                    </button>
+                </div>
+            `;
+        }
+
+        // Initialize app
+        window.onload = function() {
+            checkApiStatus();
+            document.getElementById('videoUrl').focus();
+        };
+    </script>
+</body>
+</html>

package-lock.json

@@ -0,0 +1,1064 @@
+{
+  "name": "ytdlp",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "ytdlp",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "cors": "^2.8.5",
+        "express": "^5.1.0",
+        "multer": "^2.0.2",
+        "node-fetch": "^2.7.0"
+      }
+    },
+    "node_modules/accepts": {
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+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "^3.0.0",
+        "negotiator": "^1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/append-field": {
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+      "license": "MIT"
+    },
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package.json

@@ -0,0 +1,20 @@
+{
+  "name": "ytdlp",
+  "version": "1.0.0",
+  "main": "app.js",
+  "scripts": {
+    "start": "node app.js",
+    "dev": "node app.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^5.1.0",
+    "multer": "^2.0.2",
+    "node-fetch": "^2.7.0"
+  }
+}