docs: comprehensive README with TypeScript and Unraid deployment

2026-03-07 23:06:33 -06:00
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 # PNGer - Modern PNG Editor & Resizer

-A simple, reactive, modern PNG editor and resizer with direct upload and download features. Deployed as a single Docker container on Unraid.
+A simple, reactive, modern PNG editor and resizer with direct upload and download features. Built with TypeScript and deployed as a single Docker container on Unraid.

 ## Features

 - **Drag & Drop Upload**: Intuitive file upload interface
- **Real-time Preview**: See changes as you adjust settings
 - **Resize Operations**: Width, height, and aspect ratio controls
- **Compression**: Optimize PNG file sizes
+- **Crop to Fit**: Smart cropping with position control (center, top, bottom, etc.)
+- **Format Conversion**: PNG, WebP, and JPEG output
+- **Quality Control**: Adjustable compression settings
 - **Direct Download**: No server-side storage, immediate download
- **Modern UI**: Sleek, responsive design
+- **Modern UI**: Sleek, responsive TypeScript/Svelte design

 ## Tech Stack

- **Frontend**: Svelte + Vite
- **Backend**: Node.js + Express
- **Image Processing**: Sharp
- **Container**: Docker (Alpine-based)
+- **Frontend**: Svelte 4 + Vite + TypeScript
+- **Backend**: Node.js + Express + TypeScript
+- **Image Processing**: Sharp (high-performance image library)
+- **Container**: Docker (Alpine-based, multi-stage build)
 - **Deployment**: Unraid via Docker Compose

 ## Quick Start

-### Local Development
+### Unraid Deployment (Recommended)

-```bash
-# Install dependencies
-npm install
+1. **Clone or pull this repository to your Unraid server:**
+   ```bash
+   cd /mnt/user/appdata
+   git clone https://git.alwisp.com/jason/pnger.git
+   cd pnger
+   ```

-# Run in development mode
-npm run dev
+2. **Build the Docker image:**
+   ```bash
+   docker build -t pnger:latest .
+   ```
+
+3. **Run via docker-compose:**
+   ```bash
+   docker compose up -d
+   ```
+
+4. **Access the application:**
+   - Navigate to `http://[unraid-ip]:8080`
+
+### Unraid Environment Variables (Configurable via UI)
+
+When setting up in Unraid Docker UI, you can configure:
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `HOST_PORT` | `8080` | External port to access the app |
+| `MAX_FILE_SIZE` | `10485760` | Max upload size in bytes (10MB default) |
+| `MEM_LIMIT` | `512m` | Memory limit for container |
+| `CPU_LIMIT` | `1.0` | CPU limit (1.0 = 1 full core) |
+| `NODE_ENV` | `production` | Node environment |
+
+### Unraid Docker Template Example
+
+```xml
+<?xml version="1.0"?>
+<Container version="2">
+  <Name>pnger</Name>
+  <Repository>pnger:latest</Repository>
+  <Network>bridge</Network>
+  <Privileged>false</Privileged>
+  <WebUI>http://[IP]:[PORT:8080]</WebUI>
+  <Config Name="WebUI Port" Target="3000" Default="8080" Mode="tcp" Description="Port for web interface" Type="Port" Display="always" Required="true" Mask="false">8080</Config>
+  <Config Name="Max File Size" Target="MAX_FILE_SIZE" Default="10485760" Mode="" Description="Maximum upload file size in bytes" Type="Variable" Display="advanced" Required="false" Mask="false">10485760</Config>
+  <Config Name="Memory Limit" Target="" Default="512m" Mode="" Description="Container memory limit" Type="Variable" Display="advanced" Required="false" Mask="false">512m</Config>
+</Container>
 ```

-### Docker Deployment
+## Local Development
+
+### Prerequisites
+- Node.js 20+
+- npm or yarn
+
+### Setup
+
+1. **Install backend dependencies:**
+   ```bash
+   cd backend
+   npm install
+   ```
+
+2. **Install frontend dependencies:**
+   ```bash
+   cd frontend
+   npm install
+   ```
+
+3. **Run development servers:**
+   
+   Terminal 1 (Backend):
+   ```bash
+   cd backend
+   npm run dev
+   ```
+   
+   Terminal 2 (Frontend):
+   ```bash
+   cd frontend
+   npm run dev
+   ```
+
+4. **Access dev server:**
+   - Frontend: `http://localhost:5173`
+   - Backend API: `http://localhost:3000/api`
+
+### Building for Production

 ```bash
-# Build the image
+# Backend TypeScript compilation
+cd backend
+npm run build
+
+# Frontend build
+cd frontend
+npm run build
+```
+
+## Docker Deployment (Manual)
+
+```bash
+# Build the image (all dependencies and builds are handled internally)
 docker build -t pnger:latest .

 # Run the container
-docker run -p 8080:3000 pnger:latest
+docker run -d \
+  --name pnger \
+  -p 8080:3000 \
+  -e MAX_FILE_SIZE=10485760 \
+  --restart unless-stopped \
+  pnger:latest
 ```

-### Unraid Deployment
-
-1. Clone this repository to your Unraid server
-2. Use the provided `docker-compose.yml`
-3. Access via http://[unraid-ip]:8080
-
 ## Project Structure

 ```
 pnger/
-├── frontend/          # Svelte application
-├── backend/           # Express API server
-├── Dockerfile         # Multi-stage build
-├── docker-compose.yml # Unraid deployment config
-└── INSTRUCTIONS.md    # Development guide
+├── frontend/              # Svelte + TypeScript application
+│   ├── src/
+│   │   ├── App.svelte    # Main UI component
+│   │   ├── main.ts       # Entry point
+│   │   └── lib/
+│   │       └── api.ts    # API client
+│   ├── package.json
+│   ├── tsconfig.json
+│   └── vite.config.ts
+├── backend/               # Express + TypeScript API server
+│   ├── src/
+│   │   ├── index.ts      # Express server
+│   │   ├── routes/
+│   │   │   └── image.ts  # Image transform endpoint
+│   │   └── types/
+│   │       └── image.ts  # TypeScript types
+│   ├── package.json
+│   └── tsconfig.json
+├── Dockerfile             # Multi-stage build (frontend + backend)
+├── docker-compose.yml     # Unraid deployment config
+└── INSTRUCTIONS.md        # Development guide
 ```

+## How It Works
+
+1. User uploads an image via the web interface
+2. Frontend sends image + transform parameters to backend API
+3. Backend processes image using Sharp (resize, crop, compress, convert format)
+4. Processed image is returned directly to browser
+5. Browser triggers automatic download
+6. No files stored on server (stateless operation)
+
+## API Endpoints
+
+### POST /api/transform
+
+Transform an image with resize, crop, and format conversion.
+
+**Request:**
+- Method: `POST`
+- Content-Type: `multipart/form-data`
+- Body:
+  - `file`: Image file (PNG/JPEG/WebP)
+  - `width`: Target width (optional)
+  - `height`: Target height (optional)
+  - `quality`: Quality 10-100 (optional, default: 80)
+  - `format`: Output format `png|webp|jpeg` (optional, default: `png`)
+  - `fit`: Resize mode `inside|cover` (optional, default: `inside`)
+  - `position`: Crop position when `fit=cover` (optional, default: `center`)
+
+**Response:**
+- Content-Type: `image/[format]`
+- Body: Transformed image binary
+
 ## Configuration

-Environment variables (optional):
- `PORT`: Server port (default: 3000)
- `MAX_FILE_SIZE`: Maximum upload size in MB (default: 10)
- `NODE_ENV`: production or development
+All configuration is handled via environment variables passed through Docker/Unraid:
+
+- `PORT`: Server port (default: `3000`, internal)
+- `MAX_FILE_SIZE`: Maximum upload size in bytes (default: `10485760` = 10MB)
+- `TEMP_DIR`: Temporary directory for uploads (default: `/app/temp`)
+- `NODE_ENV`: Node environment (default: `production`)

 ## License