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An Apps Script project manifest is a special JSON file that specifies a
basic project information that Apps Script needs to run the script
successfully.
Apps Script automatically creates and updates the project manifest as you
create your script project and make changes in the Apps Script editor. In most
cases you never need to view or edit the manifest directly; however, in
certain situations it may be beneficial or required.
The structure of the manifest file and its JSON fields are described in
the Manifest structure reference
guide.
Editing a manifest
The Apps Script editor hides manifest files by default in order to protect
your Apps Script project settings. Follow these steps to make a hidden project
manifest visible in the Apps Script editor:
Open the script project in the Apps Script editor.
Click Project Settingssettings.
Select the Show "appsscript.json" manifest file in editor checkbox.
The manifest file appears as a project file named appsscript.json. You
can edit this file directly in the editor and save any changes you make. To hide
the manifest file after you make your changes, repeat the previous steps and
clear the Show "appsscript.json" manifest file in editor checkbox.