Is possible to splice item in firebase database array?

user_5841735 0
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I have in my firebase database structure like this:

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I want to delete categories1, but when I am sending DELETE request to *.firebaseio.com/categories/1.json I get:

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I want to change rest indexes in my array to get array without null items. Is possible after delete categories[1] to get new array like this?:

enter image description here

firebase-realtime-database firebase
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