get-booking-prices/src/helpers/fetch.helper.ts

Tiny library to retrieve booking data (rooms with their prices) from Booking.com.

export async function fetchData(
  url: string,
  customHeaders?: Record<string, string>
): Promise<string> {
  const headers = new Headers();

  headers.set(
    'User-Agent',
    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36'
  );

  if (!!customHeaders) {
    Object.keys(customHeaders).forEach(key => {
      headers.set(key, customHeaders[key]);
    });
  }

  const res = await fetch(url, {
    method: 'GET',
    headers,
  });

  if (res.ok) {
    const data = await res.text(); // HTML raw data
    return data;
  }
  throw new Error("Couldn't fetch data");
}