How do I find the index of a value inside a JSON array?

My problem is actually checking if a JSON array has a specific number in it or not, so I was thinking that searching for an index would resolve it, but I couldn't find a straight forward way of doing it.

I'm able to achieve it through javascript, but I'd rather use blocks.

I've shared this example before:

dropbox.com/s/srgf9lme08by9wa/JSON-RecursiveRead.c3p

You can use it to browse through the entire JSON and compare value of each key/index.

Your code just taught me a couple of things, thanks.