Length()

Returns the number of characters in a string.

Marketing Cloud Engagement	✅ Yes
Marketing Cloud Next	✅ Yes

This function became available in Marketing Cloud Next during the Summer ’26 release (API version 67.0).

The Length function has one parameter:

• sourceString (string): Required. The string that you want to find the length of.

To use this function, pass it a string. This example uses the Length() function to determine if the length of a URL exceeds a certain threshold. If it does, then the function passes the URL to the WrapLongUrl() function to obtain a shortened URL. Otherwise, the function uses the original URL.

The example outputs an image with a src URL that varies based on the length of the source URL.