javascript - Json check if certain element has been received -

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I have an AJAX call for one of my services that manipulate some databases. The question I am asking for is an easy way to see if I get a certain element in my JSN. For example, I'm receiving {message: "some data message"}, but if there is an error, I want to send back {error: "my error message"}. Is there an easy way to see if an error has been sent? I think the argument is like this (it does not work) 

  $ Post ("database.json", {id: id, info: info}) .done (function) {if (data.error) {alert (data.error);} else {alert (data.message); }

You can see it with 

  (Data.hasOwnProperty ("error") {alert (data.error);} else {alert (Data.message);}

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