Properties service
GAS provides the properties service to store and/or to retrieve project-related data. The data organized as key/value pairs, can be set manually or by script codes. The following screenshot shows how you can set properties manually. To see this dialog, click on the File menu and select Project properties:
Note
You can use manually created project properties in script codes, but the properties created by code sometimes may not be visible in the Project properties dialog. You can create, update, or delete project properties in codes.
In the next task, we are going to use project properties.