Example showing how to use the proxy-chain NPM package to let headless Chrome use a proxy server with username and password

proxy-chain-example.js

const puppeteer = require('puppeteer');
const proxyChain = require('proxy-chain');

(async() => {
    const oldProxyUrl = 'http://bob:password123@proxy.example.com:8000';
    const newProxyUrl = await proxyChain.anonymizeProxy(oldProxyUrl);

    // Prints something like "http://127.0.0.1:45678"
    console.log(newProxyUrl);

    const browser = await puppeteer.launch({
        args: [`--proxy-server=${newProxyUrl}`],
    });

    // Do your magic here...
    const page = await browser.newPage();
    await page.goto('https://www.example.com');
    await page.screenshot({ path: 'example.png' });
    await browser.close();
    
    // Clean up, forcibly close all pending connections
    await proxyChain.closeAnonymizedProxy(newProxyUrl, true);
})();