Thanks for the reply @bojanvelevski.
I think the issue may be that expressions are not allowed in the JSON Generator snap? The solution to my problem is easy enough, I’ll just put a mapper snap before my JSON Generator snap and use the “null-safe access” option to fill in the blanks where needed, but I am surprised this isn’t an option in the JSON Generator snap, and I’m also not sure if any expressions are allowed.
See the very basic chain-JSON Generator pipeline that demonstrates the problem. I can’t reference the input object with an $.get(“num”) expression.
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JSON Generator Expression Test_2021_12_06.slp (4.7 KB)