XLAT Question

[Alan DeKok]

On Apr 13, 2026, at 4:59 PM, g4-lisz at tonarchiv.ch wrote:
> I read about the default / alternation syntax for string expansion, like %{%{Foo}:-bar}.
> 
> But what I needed is this: 
>   if (foo != '' ) ? '[ %{foo} ]' : 'null'.
> 
> This is for a JSON request string in a REST module configuration. The request property in question must be a JSON array (  [ .. ] ) or 'null'.
> 
> I could use Unlang IF and declare the complete JSON request in different versions depending on foo. But I would prefer to do this with expansion inside the JSON string definition, if possible.

  You'll have to use 'if'.  There is a mods-available/json, and you can do:

	%{json_encode:&foo}

  Except that if "foo" doesn't exist, it returns an empty json object: "{}"

  Alan DeKok

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