Use App Inventor Tinywebdb to get value = google_api(tag) .
This web service is a proxy to Google's Books API and is to be used in conjunction with App Inventor for Android. App Inventor apps can access this service using the TinyWebDB component and setting the ServiceURL to the URL of this site. The service returns a list of book data. You can explore how this API works by entering a tag of either search terms or an isbn in the form "isbn:xxxxxxxx" in the box below and clicking Get value :