SnapAPI/sdk/node/README.md

SnapAPI Node.js SDK

Official Node.js client for SnapAPI — the EU-hosted screenshot API.

Installation

npm install snapapi

Quick Start

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

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

With Options

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

Full-Page Capture

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

Mobile Viewport

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

Wait for Dynamic Content

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

Dark Mode Capture

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

Custom User Agent

// Set a custom User-Agent string for the request
const screenshot = await snap.capture({
  url: 'https://example.com',
  userAgent: 'Mozilla/5.0 (compatible; SnapAPI/1.0)',
  format: 'png',
});

Hide Elements Before Capture

// 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

// 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

// 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'],
});

Crop Specific Areas (Clip)

// Crop a specific rectangular area from the screenshot
const croppedScreenshot = await snap.capture({
  url: 'https://example.com',
  clip: {
    x: 100,      // X coordinate (pixels from left)
    y: 50,       // Y coordinate (pixels from top)
    width: 800,  // Width of the crop area
    height: 600, // Height of the crop area
  },
});

// Useful for capturing specific UI elements or sections
const headerScreenshot = await snap.capture({
  url: 'https://example.com',
  clip: { x: 0, y: 0, width: 1280, height: 120 }, // Top banner only
  format: 'png',
});

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)
clip	object	—	Crop rectangle: {x, y, width, height} (mutually exclusive with fullPage/selector)

snap.health()

Returns API health status.

Error Handling

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.

License

MIT — Cloonar Technologies GmbH