osu/osu.Game/IO/Serialization/KeyContractResolver.cs

// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using Humanizer;
using Newtonsoft.Json.Serialization;

namespace osu.Game.IO.Serialization
{
    public class KeyContractResolver : DefaultContractResolver
    {
        protected override string ResolvePropertyName(string propertyName)
        {
            return propertyName.Underscore();
        }
    }
}