How can I assign Null to a string in the API variable?

Hello,

I am trying to pass Null value to a String Type Variable in one of my API request, but Katalon is reading it as “NULL” instead of NULL.

Can anyone please help me with this.

Thanks,
Sharath

Groovy is case-sensitive, so are you passing Null, or null ?

even worse
if i read this right is passing as a string with value “NULL”
and is suposed to be passed to a certain API key… where in terms of json it may have to be None