How to decode a JSON string?

How to decode a JSON string?
json_decode does not work.
{"category":"\u041a\u0430\u0431\u0435\u043b\u0438, \u0430\u0434\u0430\u043f\u0442\u0435\u0440\u044b, \u0440\u0430\u0437\u0432\u0435\u0442\u0432\u0438\u0442\u0435\u043b\u0438"}
July 8th 19 at 12:11
2 answers
July 8th 19 at 12:13
July 8th 19 at 12:15
I guess that's in php,
as announced example on my server load.
9168e7a8c2044704aa7c5d11a29a6116.png

In the description of a function (json_decode), it is stated:
(PHP 5 >= 5.2.0, PECL json >= 1.2.0, PHP 7)

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