puppeteer_datalayer.js

const puppeteer = require('puppeteer')


const browser = await puppeteer.launch()
const page = await browser.newPage()
await page.goto('https://e-food.gr/')

const dl = JSON.parse(
  await page.evaluate(() => JSON.stringify(window.dataLayer))
)

// normally this will work:
// console.log(performanceTiming)
// but this sandbox doesn't dont console.log extended object in console

console.log(JSON.stringify(dl, null, 4))

await browser.close()