How to load local files in Puppeteer?

To test our Puppeteer web scrapers we might want o use local files instead of public websites. Just like real web browsers Puppeteer can load local files using the file:// URL protocol:

const puppeteer = require('puppeteer');
const path = require('path');

async function run() {
  // usual browser startup:
    const browser = await puppeteer.launch();
    const page = await browser.newPage();

    // we can use absolute paths like
    await page.goto("file://home/user/projects/test.html");  // linux
    await page.goto("file://C:/Users/projects/test.html");  // windows

    // or we can use relative paths: 
    // below will select test.html that is in the same directory as the script
    await page.goto(`file:${path.join(__dirname, 'test.html')}`);

    console.log(await page.content());
    browser.close();
}
 
run();