var otoMoto = async function (page) {
  var response = await fetch('https://www.otomoto.pl/ajax/search/list?q=11111111111111111&page=' + page);
  var text = await response.text(); // read response body as text
  var ids = text.match(/-[a-zA-Z\d]+\.html/gm);
  var idsMapped = ids.map(id => id.slice(3, -5));
    idsMapped = [...new Set(idsMapped)];

  idsMapped.forEach(
    async id => await sendReport(id)
    )

    alert('Janusze zareportowani')
  return idsMapped;
}

var sendReport = async function (id) {
  var formData = new URLSearchParams()
  formData.append('reason', 'violation');
  formData.append('msg', 'Brak poprawnego numeru VIN');
  formData.append('email', '');
  formData.append('id', id)

  await fetch('https://www.otomoto.pl/ajax/misc/report/', {
          method: 'POST',
          headers: {
            'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
          },
          body: formData
        })
}

var reportJanuszy = async function () {
  for (let i = 1; i <= 10; i++) {
        await otoMoto(i)
  }
}

reportJanuszy()