checkMultipleAccount

function checkMultipleAccount(email: string): boolean;

Signed in to several Google accounts in one browser, a person can trigger a script that then runs as another of their accounts — and writes, shares or mails as that one. Comparing the initiator's address with the effective user's is what catches it, so the script can say so instead of doing something surprising.

Parameters

Parameter	Type	Description
`email`	`string`	The address of the person who triggered the script.

Returns

boolean — true when the two addresses differ.

Throws

Exception	Condition
`InvalidEmailFormatException`	either address is missing or malformed.

Examples

In use

function onOpen(event) {
  if (checkMultipleAccount(event.user.getEmail())) {
    SpreadsheetApp.getUi().alert("You are signed in to more than one Google account.");
  }
}

Source

src/appsscript/ui/checkMultipleAccount.ts

23 September 2026

This documentation was generated with AI (Claude) from the library's source code.

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