Downloading Files Under Specific Folder using Node.js

NodeTips / googleapitips
Node.js / drive-api / download

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This sample script is for downloading files under a specific folder using Node.js. It can download files with Google Docs and others.

This sample supposes as follows. So please confirm it.

  • quickstart is used and default quickstart works fine.

In order to use this sample, please carry out as follows.

  1. Replace listFiles() of the default quickstart to this sample.
  2. Set folderid. This script can retrieve files in the folder with folderid.
  3. Delete drive-nodejs-quickstart.json. I think that there is the file at .credentials in your home directory.
  4. Change the SCOPE from var SCOPES = ['https://www.googleapis.com/auth/drive.metadata.readonly']; to var SCOPES = ['https://www.googleapis.com/auth/drive.readonly'];.
  5. Run script, retrieve the code and authorize.

Script :

function listFiles(auth) {
  var folderid = "### folder ID ###"; // Folder ID. This script downloads files in the folder with this folder ID.
  var outputExtension = "pdf"; // Extension of output file. This is adapted to only Google Docs.

  var outputMimeType = mime.lookup(outputExtension);
  var service = google.drive('v3');
  service.files.list({
    auth: auth,
    q: "'" + folderid + "' in parents and trashed=false",
    fields: "files(id, name, mimeType)"
  }, function(err, response) {
    if (err) {
      console.log('The API returned an error: ' + err);
      return;
    }
    response.files.forEach(function(e){
      if (e.mimeType.includes("application/vnd.google-apps")) {
        var dlfile = fs.createWriteStream(e.name + "." + outputExtension);
        service.files.export({
          auth: auth,
          fileId: e.id,
          mimeType: outputMimeType
        }).on('end', function() {
          console.log("'%s' was downloaded as %s.", e.name, outputExtension);
        }).on('error', function(err) {
          console.error(err);
          return process.exit();
        }).pipe(dlfile);
      } else {
        var dlfile = fs.createWriteStream(e.name);
        service.files.get({
          auth: auth,
          fileId: e.id,
          alt: 'media'
        }).on('end', function() {
          console.log("'%s' was downloaded as %s.", e.name, mime.extension(e.mimeType));
        }).on('error', function(err) {
          console.error(err);
          return process.exit();
        }).pipe(dlfile);
      }
    });
  });
}

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