I got the result of an array of links using promise.all, How can I count the links in the array?

Question

function validateAndCountLinks(arrayLinks) {
  let promises = arrayLinks.map((aLink) =>
    fetch(aLink)
      .then((response) => {
        return {
          url: response.url,
          status: response.status,
          text: response.statusText,
        };
      })
      .catch((error) => {
        return { error: error.message };
      })
  );
  return Promise.all(promises).then((result) => result);
}

Answer 1

If your goal is to check an array of links to see that they return a successful status and return the count, you should use the Response.ok property.

For example

return Promise.all(arrayLinks.map(link => fetch(link)))
  .then(responses => responses.filter(({ ok }) => ok).length)

I would not bother catching any failed fetch promises as that typically indicates a much bigger problem (eg networking error, invalid permissions, etc) which you would want to filter up to the caller for proper error handling.

validateAndCountLinks(links).then(count => {
  console.log(`${count} valid links`)
}).catch(err => {
  console.error('Networking issue', err)
})