google-play-scraper.js

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})

const MAPPINGS = {
  title: [1, 2, 0, 0],
  // description: [1, 2, 72, 0, 1],
  // descriptionHTML: [1, 2, 72, 0, 1],
  summary: [1, 2, 73, 0, 1],
  installs: [1, 2, 13, 0],
  minInstalls: [1, 2, 13, 1],
  maxInstalls: [1, 2, 13, 2],
  score: [1, 2, 51, 0, 1],
  scoreText: [1, 2, 51, 0, 0],
  ratings: [1, 2, 51, 2, 1],
}

function traverse(ko, ka) {
  console.log("____")
  let o = Object.assign({}, ko)
  let a = Object.assign({}, ka)
  while(a.length) {
    console.log(o, a)
    o = o[a.shift()]
  }
  return o
}

async function handleRequest(request) {
  let q = new URL(request.url).searchParams
  let id = q.get('id')

  const response = await fetch(`https://play.google.com/store/apps/details?id=${id}&gl=US`)
  let html = await response.text()

  let appName = html.match(/<meta property="og:title" content="(.*?) - Apps on Google Play">/)[1]
  let json = html.match(/AF_initDataCallback\(({key: 'ds:5', .*?})\);<\/script>/)[1]
  json = json.replace(/({|, )([a-z0-9A-Z_]+?):/g, '$1"$2":').replaceAll("'", '"');
  json = JSON.parse(json)
  json = json.data

  console.log(json)

  return Response.json({
    appName,
    data: Object.fromEntries(Object.entries(MAPPINGS).map(([k, v]) => [k, traverse(json, v)]))
  })
}