Testing for an empty JSON document

I have a RESTful service that performs a search and returns the results as JSON, and if there’s no results I return an empty document, {}.

Calling this search from AngularJS with $http.get(), I get the returned JSON result and everything is good if I have a document containing data, but an empty document took a bit more Googling to work out how to detect it.

From this similar question, I don’t want to use jQuery in my AngularJS app if I can avoid it (although doesn’t AngularJS have a “jQuery lite” api that maybe I can use?), so I used this approach instead:

if(Object.keys(data) == 0) { … }

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