No. The API deliberately has no such method. The only official way is go.licenseKey .
Removing the GoJS watermark is officially done by purchasing a license from Northwoods Software . The watermark appears when using the evaluation version Google Groups
Looking for a shortcut, Priest?
: Assign the received string to your library instance: javascript go.licenseKey = "YourGeneratedKeyHere" ; Use code with caution. Copied to clipboard
If you search Reddit or Stack Overflow for "gojs remove watermark," you will find dozens of frustrated developers asking for workarounds. The official answer is simple: