webscraping Nodejs structure

scraper.js

const puppeteer = require("puppeteer");
const express = require("express");

const app = express();


async function initPuppeteer() {
  const browser = await puppeteer.launch({
    args: ["--no-sandbox", "--disable-setuid-sandbox"],
  });
  const page = await browser.newPage();
  return { browser, page };
}


async function goToURL(page, url, options = { waitUntil: "load" }) {
  console.time(`Go to ${url}`);
  const u = url.startsWith("http") ? url : "http://" + url;
  await page.goto(u, options);
  console.timeEnd(`Go to ${url}`);
}





async function getProducts(url) {
  const { browser, page } = await initPuppeteer();
  await goToURL(page, "https://www.eichholtz.com/en/collection/new/new-arrivals.html?p=1");

  const res = await page.$$eval(".product-item-info", (productInfo) =>
      productInfo.map((product) => {
        return {
                url: product.querySelector(".product.photo.product-item-photo").href,
                img: product.querySelector(".product-image-photo").src,
                productSku: product.querySelector(".product-sku-value").innerText,
                productSizes: product.querySelector(".product-item-link").innerText,
        }
      })
  );

  await browser.close();
  return res;
}



async function getPagination(url){
    const paginationInfo = [];
    const { browser, page } = await initPuppeteer();
    await goToURL(page, "https://www.eichholtz.com/en/collection/new/new-arrivals.html?p=1");
    for (i = 1; i <= 3; i++) {
        var perPageProduct = await page.waitForSelector("#toolbar-amount .toolbar-number:nth-child(" + i + ")");
        var text = await page.evaluate((element) => parseInt(element.textContent),perPageProduct);
        paginationInfo.push(text);
    }

    let noOfPages = Math.ceil(paginationInfo[2] / paginationInfo[1]);
    let lastPageProduct = paginationInfo[2]%paginationInfo[1];

    await browser.close();
    
    return{
      perPageProduct:paginationInfo[1],
      totalProduct:paginationInfo[2],
      productLastPage:lastPageProduct,
      totalPages:noOfPages,
    }

}


app.get("/",async (req,res)=>{
   let data = await getData("https://www.eichholtz.com/en/collection/new/new-arrivals.html?p=1")
   res.json(data);
})


app.get("/pagination",async (req,res)=>{
   let da = await getPagination("https://www.eichholtz.com/en/collection/new/new-arrivals.html?p=1")
   res.json(da);
})

app.listen(3000, (err) =>{
  console.log("localhost:3000")
});