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javascriptfetch-api

How can I download a file using window.fetch?

If I want to download a file, what should I do in the then block below?

function downloadFile(token, fileId) {
  let url = `https://www.googleapis.com/drive/v2/files/${fileId}?alt=media`;
  return fetch(url, {
    method: 'GET',
    headers: {
      'Authorization': token
    }
  }).then(...);
}

Note: The code is on the client-side.

Solution

  • I temporarily solve this problem by using download.js and blob.

    let download = require('./download.min');

...

function downloadFile(token, fileId) {
  let url = `https://www.googleapis.com/drive/v2/files/${fileId}?alt=media`;
  return fetch(url, {
    method: 'GET',
    headers: {
      'Authorization': token
    }
  }).then(function(resp) {
    return resp.blob();
  }).then(function(blob) {
    download(blob);
  });
}

    It's working for small files, but maybe not working for large files. I think I should dig Stream more.