Properites of an object in JSON are considered unordered, so it makes no sense to access them via an index.
You could consider duplicating the data in the JSON once in an object, once in an array, that is how ever usually a bad idea, since the point of JSOn usally is to be consise.
Better would be to have the application using the data, preprocess it and "convert" the object into an array (or vice versa).
For a more detailed answer you will need to provide a pertinent example.
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