I have the same issue. I want to add the json data from the previous node, but if I just use $json it doesn’t work out… The next node tells me it’s not valid json 
This is how the expression evaluates in my Set parameter with expression.
I have the same issue. I want to add the json data from the previous node, but if I just use $json it doesn’t work out… The next node tells me it’s not valid json
This is how the expression evaluates in my Set parameter with expression.