Instance of JsonData Doesn't hold an int even though im typcasting..

Hey guys so i'm writing an inventory script passing data using JSON. I started following a guide online however I am casting the same way as him yet I am getting an error.

Here is my script I'm using (on a inventory game object in scene) using System.Collections; using System.Collections.Generic; using UnityEngine; using LitJson; using System.IO;

 public class ItemDatabase : MonoBehaviour {
 
     //creating a list to hold our database called databse
     private List<Item> database = new List<Item>();
     //creates jsondata object that holds all the data we pull in from the string
     private JsonData itemData;
 
 
     void Start()
     {
         //changes json data to a object this is pulling from streaming assets folder in assets from game (Streaming assets does not get built on build) people cant change items
         //works as a dictionary
         itemData = JsonMapper.ToObject (File.ReadAllText(Application.dataPath + "/StreamingAssets/Items.json"));
 
         //running construct item method
         ConstructItemDatabase ();
 
         Debug.Log (database[1].Title);
     }
 
     //set up system to laod data from the json file
     void ConstructItemDatabase()
     {
         //loops through the item data list to add it to the ItemDatabase
         for (int i = 0; i < itemData.Count; i++)
         {
             database.Add (new Item ((int)itemData[i]["id"], itemData[i]["title"].ToString(), (int)itemData[i]["value"]));
         }
     }
 }
     
 
 //this will hold all the properites of the item ex. stats id name
 public class Item
 {
     public int ID { get; set;}
     public string Title { get; set;}
     public int Value { get; set; }
 
     public Item(int id, string title, int value)
     {
         this.ID = id;
         this.Title = title;
         this.Value = value;
     }
 }

This is my JSON script

 [
     {
         "id": 0,
         "title": "Shitty Sword",
         "value": "6"
     },
     {
         "id": 1,
         "title": "Steel Gloves",
         "value": "123"
     }
 ]

I know it was to do with the way I am typecasting in the ConstructItemDatabase() but I dont understand why..

Please help Thanks