list and dict

using System;
using System.Collections.Generic;
using UnityEngine;

public static class JsonUtilityList
{
    public static List<T> FromJson<T>(string json)
    {
        Wrapper<T> wrapper = JsonUtility.FromJson<Wrapper<T>>(json);
        return wrapper.Items;
    }

    public static string ToJson<T>(List<T> list, bool prettyPrint = false)
    {
        Wrapper<T> wrapper = new Wrapper<T>(list);
        return JsonUtility.ToJson(wrapper, prettyPrint);
    }


    [Serializable]
    private class Wrapper<T>
    {
        public List<T> Items;
        public Wrapper(List<T> items)
        {
            Items = items;
        }
    }
}

using UnityEngine;
using System.Collections.Generic;

[System.Serializable]
public class SerializableDictionary<TKey, TValue> : Dictionary<TKey, TValue>, ISerializationCallbackReceiver
{
    [SerializeField] private List<TKey> keys = new List<TKey>();
    [SerializeField] private List<TValue> values = new List<TValue>();


    public void OnBeforeSerialize()
    {
        keys.Clear();
        values.Clear();
        foreach (KeyValuePair<TKey, TValue> pair in this)
        {
            keys.Add(pair.Key);
            values.Add(pair.Value);
        }
    }

    public void OnAfterDeserialize()
    {
        this.Clear();

        if (keys.Count != values.Count)
            Debug.LogError(" the amount of keys ("+ keys.Count + ") does not match the number of values (" + values.Count + ") so something went wrong");

        for (int i = 0; i < keys.Count; i++)
            this.Add(keys[i], values[i]);

    }
}