How to use $today function to find matching JSON value?

[ryzen3100]

Hi,
How to use the $today function to parse a matching JSON value? (the $today would return "day X")
Example:

<pre id="data" hidden>{
        "2022-10-16": "day A",
        "2022-10-17": "day B",
        "2022-10-18": "day C",
        "2022-10-19": "day D",
        "2022-10-20": "day E"

    }</pre>

<div mv-app="dataStorage" mv-storage="#data">
  [set(tDay, $today)]
    <span property="tDay">#</span>

  <p>Data match for today: [tDay]</p>
 </div>

[LeaVerou]

Please note that set() will not work in an expression, it's an action function and will exclusively work in Actions.

Your Mavo template does not seem to correspond to the data you have. The JSON this Mavo app would produce is

{
	"tDay": "#"
}

If your data comes from elsewhere, you can do [get(dataStorage, $today)] to get the day name, but do note Mavo cannot create such an object with variable property names (except perhaps with a bunch of workarounds).