ArgumentException: JSON parse error: Missing a name for object member, unity 2019.2.4f1

Question

I'm trying to fetch data from php api's. stuck on this error

ArgumentException: JSON parse error: Missing a name for object member. UnityEngine.JsonUtility.FromJson (System.String json, System.Type type) (at C:/buildslave/unity/build/Modules/JSONSerialize/Public/JsonUtility.bindings.cs:42) UnityEngine.JsonUtility.FromJson[T] (System.String json) (at C:/buildslave/unity/build/Modules/JSONSerialize/Public/JsonUtility.bindings.cs:30) RestClient+d__3.MoveNext () (at Assets/_Scripts/RestClient.cs:34) UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at C:/buildslave/unity/build/Runtime/Export/Scripting/Coroutines.cs:17)

here is my json response

[
   {
      "id":"1",
      "name":"Yasir",
      "mobile":"0301",
      "password":"123"
   },
   {
      "id":"2",
      "name":"Mehmood",
      "mobile":"0302",
      "password":"123"
   },
   {
      "id":"3",
      "name":"Imran",
      "mobile":"0301",
      "password":"123"
   },
   {
      "id":"4",
      "name":"Iqbal",
      "mobile":"0302",
      "password":"123"
   }
]

ReastClient.cs

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

public class RestClient : MonoBehaviour
{
    private static RestClient _instance;
    public static RestClient Instance{
        get{
            if(_instance == null){
                _instance = FindObjectOfType<RestClient>();
                if(_instance == null){
                    GameObject go = new GameObject();
                    go.name =typeof(RestClient).Name;
                    _instance = go.AddComponent<RestClient>();
                }
            }
            return _instance;
        }
    }

    public IEnumerator Get(string url, System.Action<PlayerList> callBack)
    {
        using (UnityWebRequest www = UnityWebRequest.Get(url))
        {
            yield return www.SendWebRequest();
            if (www.isNetworkError)
            {
                print(www.error);
            }else if (www.isDone)
            {
                string jsonResult = System.Text.Encoding.UTF8.GetString(www.downloadHandler.data);
                PlayerList playerlist = JsonUtility.FromJson<PlayerList>(jsonResult);
                callBack(playerlist);
            }
        }
    }

}

Game.cs

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

public class Game : MonoBehaviour
{
    public string web_url = "";
    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine(RestClient.Instance.Get(web_url,GetPlayers));
    }

    void GetPlayers(PlayerList playerlist)
    {
        foreach(Player player in PlayerList.players)
        {
            print("Player Id = " + player.id);

        }

    }
}

PlayerList.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
[System.Serializable]
public class PlayerList
{
    public static List<Player> players;
}

Player.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
[System.Serializable]
public class Player 
{
    public int id;
    public string title;
    public string body;
}

It's my complete code for fetching data from web api's, but getting

ArgumentException: JSON parse error: Missing a name for object member

I'm using unity 2019.2.4f1

Answer 1

To be honest, JsonUtility has always given me nothing but headaches. I recommend using Json.NET instead.

In addition, @Parsa_Rt has pointed out, your Json is directly referencing the array, so you could simply extract the players this way:

 List<Player> playerlist = JsonConvert.DeserializeObject<List<Player>>(jsonResult);
 foreach (var player in playerlist)
 {
     print("Player Id = " + player.id);
 }

Answer 2

in your response you have declared a list but the list does not have any name , how can you have a List variable without name , all variables must have names. in your PlayerList class you have a variable called "players" holding a list of players , but in your response you didnt declare that so in order for it to work your response must look like this :

{
     "Player":
     [
       {
          "id":"1",
          "name":"Yasir",
          "mobile":"0301",
          "password":"123"
       },
       {
          "id":"2",
          "name":"Mehmood",
          "mobile":"0302",
          "password":"123"
       },
       {
          "id":"3",
          "name":"Imran",
          "mobile":"0301",
          "password":"123"
       },
       {
          "id":"4",
          "name":"Iqbal",
          "mobile":"0302",
          "password":"123"
       }
     ]

}