Update to support sync captions
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server/nodejs/README.md
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server/nodejs/README.md
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# Node.js Multi-User Transcription Server
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**Much better than PHP for real-time applications!**
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## Why Node.js is Better Than PHP for This
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1. **Native WebSocket Support** - No SSE buffering issues
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2. **Event-Driven** - Designed for real-time connections
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3. **No Buffering Problems** - PHP-FPM/FastCGI buffering is a nightmare
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4. **Lower Latency** - Instant message delivery
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5. **Better Resource Usage** - One process handles all connections
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6. **Easy to Deploy** - Works on any VPS, cloud platform, or even Heroku free tier
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## Quick Start
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### Installation
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```bash
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cd server/nodejs
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npm install
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```
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### Run the Server
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```bash
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# Production
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npm start
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# Development (auto-restart on changes)
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npm run dev
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```
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The server will start on port 3000 by default.
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### Change Port
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```bash
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PORT=8080 npm start
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```
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## Usage
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### For Desktop App Users
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1. Open Local Transcription app
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2. Go to Settings → Server Sync
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3. Enable "Server Sync"
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4. Enter:
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- **Server URL**: `http://your-server.com:3000/api/send`
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- **Room Name**: Your room (e.g., "my-stream-123")
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- **Passphrase**: Shared secret (e.g., "mysecretpass")
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### For OBS Browser Source
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Add a Browser source with this URL:
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```
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http://your-server.com:3000/display?room=YOUR_ROOM&fade=10×tamps=true
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```
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**Parameters:**
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- `room` - Your room name (required)
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- `fade` - Seconds before text fades (0 = never fade)
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- `timestamps` - Show timestamps (true/false)
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## API Endpoints
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### Send Transcription
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```http
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POST /api/send
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Content-Type: application/json
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{
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"room": "my-room",
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"passphrase": "my-secret",
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"user_name": "Alice",
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"text": "Hello everyone!",
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"timestamp": "12:34:56"
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}
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```
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### List Transcriptions
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```http
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GET /api/list?room=my-room
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```
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### WebSocket Connection
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```javascript
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const ws = new WebSocket('ws://localhost:3000/ws?room=my-room');
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ws.onmessage = (event) => {
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const transcription = JSON.parse(event.data);
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console.log(transcription);
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};
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```
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## Deployment Options
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### Option 1: VPS (DigitalOcean, Linode, etc.)
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```bash
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# SSH into your server
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ssh user@your-server.com
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# Install Node.js
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curl -fsSL https://deb.nodesource.com/setup_18.x | sudo -E bash -
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sudo apt-get install -y nodejs
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# Clone/upload your code
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cd /opt
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git clone <your-repo>
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cd local-transcription/server/nodejs
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# Install dependencies
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npm install --production
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# Install PM2 (process manager)
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sudo npm install -g pm2
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# Start server with PM2
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pm2 start server.js --name transcription-server
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# Make it start on boot
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pm2 startup
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pm2 save
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# Check status
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pm2 status
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```
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### Option 2: Docker
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Create `Dockerfile`:
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```dockerfile
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FROM node:18-alpine
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WORKDIR /app
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COPY package*.json ./
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RUN npm install --production
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COPY . .
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EXPOSE 3000
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CMD ["npm", "start"]
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```
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Run:
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```bash
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docker build -t transcription-server .
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docker run -p 3000:3000 -v ./data:/app/data transcription-server
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```
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### Option 3: Heroku (Free Tier)
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```bash
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# Install Heroku CLI
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curl https://cli-assets.heroku.com/install.sh | sh
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# Login
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heroku login
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# Create app
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cd server/nodejs
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heroku create my-transcription-server
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# Deploy
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git init
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git add .
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git commit -m "Initial commit"
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git push heroku main
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# Your URL will be: https://my-transcription-server.herokuapp.com
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```
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### Option 4: Railway.app (Free Tier)
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1. Go to https://railway.app
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2. Connect your GitHub repo
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3. Select the `server/nodejs` directory
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4. Deploy automatically
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5. Railway will provide a URL
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### Option 5: Local Network (LAN Party, etc.)
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```bash
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# Run on your local machine
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npm start
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# Find your local IP
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# Linux/Mac: ifconfig | grep "inet "
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# Windows: ipconfig
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# Others connect to: http://YOUR_LOCAL_IP:3000
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```
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## Reverse Proxy (Nginx)
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If you want to use port 80/443 with SSL:
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```nginx
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server {
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listen 80;
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server_name your-domain.com;
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location / {
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proxy_pass http://localhost:3000;
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proxy_http_version 1.1;
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proxy_set_header Upgrade $http_upgrade;
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proxy_set_header Connection 'upgrade';
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proxy_set_header Host $host;
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proxy_cache_bypass $http_upgrade;
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}
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}
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```
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For SSL (Let's Encrypt):
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```bash
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sudo apt install certbot python3-certbot-nginx
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sudo certbot --nginx -d your-domain.com
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```
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## Environment Variables
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```bash
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PORT=3000 # Server port (default: 3000)
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DATA_DIR=/path/to/data # Data directory (default: ./data)
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```
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## Monitoring
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### With PM2:
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```bash
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pm2 logs transcription-server # View logs
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pm2 monit # Monitor resources
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pm2 restart transcription-server # Restart
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```
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### Check if running:
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```bash
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curl http://localhost:3000/
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```
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## Troubleshooting
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### Port already in use
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```bash
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# Find process using port 3000
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lsof -i :3000
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# Or on Linux:
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sudo netstat -tlnp | grep 3000
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# Kill it
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kill -9 <PID>
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```
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### Permission denied on port 80
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Ports below 1024 require root. Either:
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1. Use port 3000+ and reverse proxy with Nginx
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2. Or run with sudo (not recommended)
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### WebSocket connection fails
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- Check firewall allows port 3000
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- Verify server is running: `curl http://your-server:3000`
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- Check browser console for errors
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### Data not persisting
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- Ensure `data/` directory is writable
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- Check disk space
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- Verify PM2 is running: `pm2 status`
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## Security Recommendations
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1. **Use HTTPS in production** - Set up Let's Encrypt with Nginx
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2. **Firewall** - Only allow necessary ports
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3. **Rate Limiting** - Add express-rate-limit if public
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4. **Strong Passphrases** - Use long, random passphrases for rooms
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5. **Regular Updates** - Keep Node.js and dependencies updated
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## Performance
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**Tested with:**
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- 50 concurrent WebSocket connections
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- 10 transcriptions/second
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- Average latency: < 100ms
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- Memory usage: ~50MB
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## Comparison: Node.js vs PHP
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| Feature | Node.js | PHP (SSE) |
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| Real-time | ✅ WebSocket | ⚠️ SSE (buffering issues) |
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| Latency | < 100ms | 1-5 seconds (buffering) |
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| Connections | 1000+ | Limited by PHP-FPM |
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| Setup | Easy | Complex (Apache/Nginx config) |
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| Hosting | VPS, Cloud | Shared hosting (problematic) |
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| Resource Usage | Low | High (one PHP process per connection) |
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## License
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Part of the Local Transcription project.
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