SnapAPI/sdk/node/README.md

# SnapAPI Node.js SDK

Official Node.js client for [SnapAPI](https://snapapi.eu) — the EU-hosted screenshot API.

## Installation

```bash
npm install snapapi
```

## Quick Start

```typescript
import { SnapAPI } from 'snapapi';
import fs from 'fs';

const snap = new SnapAPI('your-api-key');

// Simple screenshot
const png = await snap.capture('https://example.com');
fs.writeFileSync('screenshot.png', png);
```

## Usage

### Basic Screenshot

```typescript
const screenshot = await snap.capture('https://example.com');
```

### With Options

```typescript
const screenshot = await snap.capture('https://example.com', {
  format: 'jpeg',
  width: 1920,
  height: 1080,
  quality: 90,
});
```

### Full-Page Capture

```typescript
const screenshot = await snap.capture({
  url: 'https://example.com/blog',
  fullPage: true,
  format: 'png',
  deviceScale: 2, // Retina
});
```

### Mobile Viewport

```typescript
const screenshot = await snap.capture({
  url: 'https://example.com',
  width: 375,
  height: 812,
  deviceScale: 2,
});
```

### Wait for Dynamic Content

```typescript
const screenshot = await snap.capture({
  url: 'https://example.com/dashboard',
  waitForSelector: '#chart-loaded',
  waitUntil: 'networkidle2',
});
```

### Dark Mode Capture

```typescript
// Capture in dark mode (prefers-color-scheme: dark)
const darkScreenshot = await snap.capture({
  url: 'https://example.com',
  darkMode: true,
  format: 'png',
});
```

### Hide Elements Before Capture

```typescript
// Hide cookie banners, popups, ads
const cleanScreenshot = await snap.capture({
  url: 'https://example.com',
  hideSelectors: [
    '.cookie-banner',
    '.popup-overlay', 
    '#advertisement',
    '.tracking-notice'
  ],
});

// Hide single element
const singleHide = await snap.capture('https://example.com', {
  hideSelectors: '.newsletter-popup',
});
```

### Custom CSS Injection

```typescript
// Inject custom CSS before capture
const styled = await snap.capture({
  url: 'https://example.com',
  css: 'body { background: #1a1a2e !important; color: #eee !important; font-family: "Comic Sans MS" }',
});

// Combine with other options
const combined = await snap.capture({
  url: 'https://example.com',
  css: '.hero { padding: 80px 0 } h1 { font-size: 48px }',
  darkMode: true,
  hideSelectors: ['.cookie-banner'],
});
```

### JavaScript Injection

```typescript
// Execute custom JavaScript before capture
const interactiveScreenshot = await snap.capture({
  url: 'https://example.com',
  js: `
    // Dismiss modal popup
    document.querySelector('.modal-overlay')?.remove();
    
    // Scroll to specific content
    window.scrollTo(0, 500);
    
    // Click button to reveal content
    document.querySelector('#show-more-btn')?.click();
    
    // Wait for animation to complete
    await new Promise(resolve => setTimeout(resolve, 1000));
  `,
});

// Combine with other options for complex scenarios
const complexCapture = await snap.capture({
  url: 'https://example.com/app',
  js: 'document.querySelector(".sidebar").style.display = "none";',
  css: 'body { zoom: 0.8 }',
  waitForSelector: '#content-loaded',
  hideSelectors: ['.ad-banner', '.cookie-notice'],
});
```

## API Reference

### `new SnapAPI(apiKey, config?)`

| Parameter | Type | Description |
|-----------|------|-------------|
| `apiKey` | `string` | Your SnapAPI API key (required) |
| `config.baseUrl` | `string` | API base URL (default: `https://snapapi.eu`) |
| `config.timeout` | `number` | Request timeout in ms (default: `30000`) |

### `snap.capture(url, options?)` / `snap.capture(options)`

Returns a `Promise<Buffer>` containing the screenshot image.

| Option | Type | Default | Description |
|--------|------|---------|-------------|
| `url` | `string` | — | URL to capture (required) |
| `format` | `'png' \| 'jpeg' \| 'webp'` | `'png'` | Output format |
| `width` | `number` | `1280` | Viewport width (320–3840) |
| `height` | `number` | `800` | Viewport height (200–2160) |
| `fullPage` | `boolean` | `false` | Capture full scrollable page |
| `quality` | `number` | `80` | JPEG/WebP quality (1–100) |
| `waitForSelector` | `string` | — | CSS selector to wait for |
| `deviceScale` | `number` | `1` | Device pixel ratio (1–3) |
| `delay` | `number` | `0` | Extra delay in ms (0–5000) |
| `waitUntil` | `string` | `'domcontentloaded'` | Load event to wait for |
| `darkMode` | `boolean` | `false` | Emulate prefers-color-scheme: dark |
| `hideSelectors` | `string \| string[]` | — | CSS selectors to hide before capture |
| `css` | `string` | — | Custom CSS to inject before capture (max 5000 chars) |

### `snap.health()`

Returns API health status.

### Error Handling

```typescript
import { SnapAPI, SnapAPIError } from 'snapapi';

try {
  const screenshot = await snap.capture('https://example.com');
} catch (err) {
  if (err instanceof SnapAPIError) {
    console.error(`API error ${err.status}: ${err.detail}`);
  }
}
```

## EU-Hosted & GDPR Compliant

SnapAPI runs entirely on EU infrastructure (Germany). Your data never leaves the EU. [Learn more](https://snapapi.eu).

## License

MIT — [Cloonar Technologies GmbH](https://snapapi.eu)