You want to test an interface in Business Central, but you always have to Publish your app, because of changing variables?

You can get around this issue with this JSON-Form type AL Page.

Create a JSON Object with a scheme like this:

Pass that JSON to the form-opening procedure:

And upon using it you should have results like these:

You can also use it to just receive singular values from the form.

Check out the Test Page to get familiar with it.

Have Fun!

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Update #1

You can now type 0 on the selection page to receive your request as text.

Edit the text in an editor to your preferences, and copy it back to the input field.

After pressing OK, the text input is processed as the JSON Object.