I've been asked to review this code fully, and I've done that. Here's a list of my complaints. Error handling is very opportnistic. In particular, I believe that these lines...

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не там все норм оказывается, system.text.json кормит меня хуями
public static bool TryBeautifyJson(ref string s)
       {
           var options = new JsonSerializerOptions()
           {
               WriteIndented = true
           };

           JsonElement jsonElement;
           try
           {
               jsonElement = JsonSerializer.Deserialize<JsonElement>(s);
           }
           catch (JsonException)
           {
               return false;
           }

           s = JsonSerializer.Serialize(jsonElement, options);
           return true;
       }