Example showing how to serialize and deserialize arrays of data in Unty

JsonExample02.cs

// Attach this script to a gameobject in the scene. objectDetails01 is serialized into JSON and stored 
// in a string. Then the JSON string is deserialized and cast to ObjectDetails type, and stored into 
// objectDetails02. The data of objectDetails02 can be seen in the Inspector.
using UnityEngine;

public class JsonExample02 : MonoBehaviour {

	public ObjectDetails objectDetails01;
	public ObjectDetails objectDetails02;

	// Use this for initialization
	void Start () {

		// Serialize to JSON and store in a string.
		string s = JsonUtility.ToJson(objectDetails01, true);
		Debug.Log(s);
		
		// Deserialize from JSON and cast to ObjectDetails type.
		objectDetails02 = (ObjectDetails)JsonUtility.FromJson(s, typeof(ObjectDetails));

	}
	
	// Update is called once per frame
	void Update () {
		
	}
}

[System.Serializable]
public class ObjectDetail
{
	public string Name;
	public Vector3 WorldPosition;
}

[System.Serializable]
public class ObjectDetails
{
	public ObjectDetail[] ObjectDetailArr;
}