Add-ons built using Apps Script can use the many built-in G Suite services it provides to access G Suite application data. You can also use Apps Script advanced services to directly access the correspoding REST API from your add-on script project. Apps Script also provides built-in script services to assist with common tasks that aren't connected to a particular G Suite application (such as logging or data compression).
The following table lists services that are often particularly useful when building add-ons.
| G Suite services | |
|---|---|
| Calendar service | Access and modify user Google Calendar data. |
| Document service | Create, access, and edit Google Docs. |
| Drive service | Create, access, and modify files in Google Drive. |
| Forms service | Create, access, and edit Google Forms. |
| Gmail service | Access user Gmail data and messages. |
| Slides service | Create, access, and edit Google Slides presentations. |
| Sheets service | Create, access, and edit Google Sheets. |
| Advanced Google services | |
| Advanced Calendar service | Use the Calendar v3 REST API from your add-on script project. |
| Advanced Drive service | Use the Drive v2 REST API from your add-on script project. |
| Advanced Gmail service | Use the Gmail v1 REST API from your add-on script project. |
| Advanced Sheets service | Use the Sheets v4 REST API from your add-on script project. |
| Advanced Slides service | Use the Slides v1 REST API from your add-on script project. |
| Script services | |
| console | Log information to Stackdriver. This is usually preferable to using the simpler Logger service. |
| HTML service | Create and serve HTML. This service is used to build user interfaces for editor add-on sidebars and dialogs. For more information, see the Apps Script guide to HTML service. |
| Properties service | Store and retrieve add-on state and other information using property strings. |
| Script service | Access script triggers and other script-level information. |
| URL Fetch service | Retrieve and post information from or to third-party URLs. Often it is helpful to use the OAuth2 library for Apps Script in conjunction with this service to handle the details of OAuth2 authorization for third-party APIs. |
| Utilities service | Helper methods to handle data compression, encoding, decoding, JSON manipulation, and other miscellaneous tasks. |