How to pass Json array to WWWform as field in unity

Try using WWW instead of WWWForm

    using UnityEngine;    using UnityEngine.UI;    using System.Collections;    using System.Collections.Generic;    public class SendData : MonoBehaviour {     void Start()     {         gameObject.GetComponent<Button>().onClick.AddListener(SendOnClick);     }     IEnumerator WaitForWWW(WWW www)     {         yield return www;         string txt = "";         if (string.IsNullOrEmpty(www.error))             txt = www.text;  //text of success         else             txt = www.error;  //error         GameObject.Find("TextDemo").GetComponent<Text>().text =  "--------\n\n" + txt;     }     void SendOnClick()     {         try         {             GameObject.Find("TextDemo").GetComponent<Text>().text = "Starting..";                string ourPostData = "{\"MarksA\":\"23\",\"MarksB\":\"65\" },{\"MarksA\":\"24\",\"MarksB\":\"56\" }";             Dictionary<string,string> headers = new Dictionary<string, string>();             headers.Add("Content-Type", "application/json");             byte[] jData = System.Text.Encoding.ASCII.GetBytes(ourPostData.ToCharArray());             WWW api = new WWW("YOUR URL", jData, headers);             StartCoroutine(WaitForWWW(api));         }         catch (UnityException ex) { Debug.Log(ex.message); }     }    }