How to set screenshot size in Puppeteer?

Problem:

You are trying to make a screenshot using Puppeteer like this:

await page.screenshot({path: 'screenshot.png'});

but the screenshot is always 800x600 pixels. How can you increase the size of the screenshot?

Solution:

You can’t set the size for the screenshot, you need to set the size for the viewport in puppeteer.launch:

const browser = await puppeteer.launch({
    defaultViewport: {width: 1920, height: 1080}
});

Full example to produce a 1920x1080 screenshot:

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch({
      defaultViewport: {width: 1920, height: 1080}
  });
  const page = await browser.newPage();
  await page.goto('https://techoverflow.net', {waitUntil: 'domcontentloaded'});
  // Wait until page has loaded completely
  // Make a screenshot
  await page.screenshot({path: 'screenshot.png'});

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