Get shared link through Google Drive API

To actually enable link sharing using Google Drive API:

drive.permissions.create({
  fileId: '......',
  requestBody: {
    role: 'reader',
    type: 'anyone',
  }
});

Get the webLinkView value using:

const webViewLink = await drive.files.get({
    fileId: file.id,
    fields: 'webViewLink'
}).then(response => 
    response.data.webViewLink
);

You can use the alternateLink property in the File resource to get a link that can be shared for opening the file in the relevant Google editor or viewer:

https://developers.google.com/drive/v2/reference/files

Update

[With API V3](https://developers.google.com/drive/api/v3/reference/files it is suggested to use the webViewLink property.