How to validate a field without complicating?

Questions
1

I have a loop that sometimes I have DATA in a specific variable but sometimes I don’t.

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Wondering if there is a simple way to make an IF statement inside an expression? and if empty print something like a string -not found-

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2

Welcome to the community @igcorreia.

If I understand you correctly the following should work:

{{ $json["parameterName"] ? $json["parameterName"] : '-not found-' }}
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3

Yes, Yes and Yes! Are there any docs regarding this?

4

That is plain old JavaScript, so you should find things like that on Google. Apart from that did we start to collect some example snippets here:

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