Freely grab screenshots of web pages via Google's hidden PageSpeed API.

index.js

const { get } = require('snekfetch');

/**
 * @typedef {Object} Query
 * @prop {'mobile'|'desktop'} strategy The strategy to use when taking the screenshot
 */

/**
 * Screenshot a web page using its URL
 * @param {string} url Web page URL to screenshot
 * @param {?Query} query Extra querystring parameters
 * @returns {Promise<String>} Base64 encoded image
 */

module.exports = (url, query = {}) =>
	get('https://www.googleapis.com/pagespeedonline/v1/runPagespeed')
		.query({
			screenshot: true,
			strategy: 'desktop',
			...query,
			url,
		})
		.then(res => res.body.screenshot.data.replace(/_/g, '/').replace(/-/g, '+'));

package.json

{
	"author": "lloti <dimggyt@gmail.com> (https://dim.codes)",
	"name": "page-screenshotter",
	"version": "1.0.0",
	"description": "Freely grab screenshots of web pages via Google's hidden PageSpeed API.",
	"private": true,
	"dependencies": {
		"snekfetch": "^4.0.0"
	}
}