Without this initial configuration, any attempt to programmatically manage sheets will result in authentication errors or access denials. The configuration determines whether your app runs on a server, in a browser, or from a local machine.
Enable Google Sheets API Step by Step
Click the project dropdown and select "New Project". Select the application type, usually "Desktop app" for scripts.
It is also wise to have a specific Google Sheet ready for testing immediately after activation. This involves creating OAuth 2.
Step-by-Step Guide to Enable Google Sheets API with Credentials
Skipping this step is the most common reason for early failure in connection attempts. Setting Up Credentials Navigate to "APIs & Services" > "Credentials" in the sidebar.
More About How to enable google sheets api
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