環境

Mac
Node.js v15.3.0
Npm 7.0.14
puppeteer 5.5.0

■ Puppeteer導入

1. Puppeteerインストール

npm install puppeteer

2. 動作確認

スクリーンショット取得

example.js

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto('https://example.com');
  await page.screenshot({path: 'example.png'});

  await browser.close();
})();

node example.js

PDF取得

hn.js

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto('https://news.ycombinator.com', {waitUntil: 'networkidle2'});
  await page.pdf({path: 'hn.pdf', format: 'A4'});

  await browser.close();
})();

node hn.js

viewport取得

get-dimensions.js

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto('https://example.com');

  // Get the "viewport" of the page, as reported by the page.
  const dimensions = await page.evaluate(() => {
    return {
      width: document.documentElement.clientWidth,
      height: document.documentElement.clientHeight,
      deviceScaleFactor: window.devicePixelRatio
    };
  });

  console.log('Dimensions:', dimensions);

  await browser.close();
})();

node get-dimensions.js

■ 実行オプション

ブラウザ表示

const browser = await puppeteer.launch({headless: false}); // default is true

Chromiumのバージョン指定

const browser = await puppeteer.launch({executablePath: '/path/to/Chrome'});