How do I go about deserializing a json array?

Question

I'm currently making a Task system for my game and I want task data to be stored within a json file like so:

 [
   {
       "name": "Task one",
       "description": "This is task one",
       "type": 0
   },
   {
       "name": "Task two",
       "description": "This is task two",
       "type": 2
   },
   {
       "name": "Task three",
       "description": "This is task three",
       "type": 1
   }
 ]

Although it doesn't seem like Unity has any way of handling json arrays. How do I do this?

Answer 1

Best Answer

Answer by Arcana96 · Dec 27, 2016 at 05:58 PM

Here's a helper class that does it all for you.

 public class JsonHelper
 {
     public static T[] getJsonArray<T>(string json)
     {
         string newJson = "{ \"array\": " + json + "}";
         Wrapper<T> wrapper = JsonUtility.FromJson<Wrapper<T>>(newJson);
         return wrapper.array;
     }
 
     [System.Serializable]
     private class Wrapper<T>
     {
         public T[] array;
     }
 }

Then you can just do something like the following:

YourClass[] yourClass; yourClass = JsonHelper.getJsonArray(Your Json Data);

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KnightRiderGuy · Dec 27, 2016 at 06:08 PM 0

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I realize this is a little off topic but just out of curiosity, is there a document size limit on son files?

Arcana96 KnightRiderGuy · Dec 28, 2016 at 09:46 PM 0

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There's not an inherent size, no. However, some servers limit the amount of Json data that can be sent.

KnightRiderGuy Arcana96 · Dec 31, 2016 at 02:27 AM 0

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Thanks @Arcana96, Reason I ask is because we are using a tyson file for our Voice Recognition inputs, I seem to have reached a point in the document where if I try and add more voice commands the file no longer works.... and that was why I was wondering if there was a size limit on the document itself?

craftercis · Oct 26, 2018 at 10:33 AM 0

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Can you please send your scripts here so i can see how you get the JSON file so.

Answer 2

With SimpleJson In the web call back function we will deserialize the response Json into an array or list.

static void WebCall (string jsonString) {  Debug.Log ("Response :" + jsonString);

 JSONNode test = JSONNode.Parse (jsonString);

 int count = test.Childs.Count ();

 List<User> userList = new List<User>();

 for (int i = 0; i<test.Childs.Count(); i++) {

     userList[i].name = test[i]["name"].Value;
     userList[i].description = test[i]["name"].Value;
     userList[i].type = test[i]["name”].AsInt;
 }

}

[System.Serializable] public class User {

 public string name;
 public string description;
 public int type;

}

2 And simply with JsonUtility you can do

  static void WebCall(){         
         string response = "{\"users\": [\ n   {\ n       \ "name\ ": \ "Task one\ ",\ n       \ "description\ ": \ "This is task one\ ",\ n       \     "type\ ": 0\ n   },\ n   {\ n       \ "name\ ": \ "Task two\ ",\ n       \ "description\ ": \ "This is task two\ ",\ n       \ "type\ ": 2\     n   },\ n   {\ n       \ "name\ ": \ "Task three\ ",\ n       \ "description\ ": \ "This is task three\ ",\ n       \ "type\ ": 1\ n   }\ n ]}";                 
             Debug.Log ("Response :" + response);                          
     UserList userLst = JsonUtility.FromJson<UserList>(response);                                   
     foreach(User user in userLst){                                          
     Debug.Log(“User data: "+ user.name + " " + user.description + “ “ + user.type.ToString());                 
     }                      
         [System.Serializable]
          public class User {
             public string name;
             public string description;
             public int type;
         }             
             [System.Serializable]             
             public class UserList {                          
                 public User [] users;  //Note: users - should be the key for your array in json string.             
             }

Answer 3

Answer by CaptainIsolation · Feb 16 at 08:41 PM

If anyone come's here with JSON data that is deserialising but an inner array of objects is not deserialising, the [Serializable] tag on the inner object was all that I had missed:

JSON:

 {
   "Name": "name",
    "InnerObjects":[
      {
       "Value1":"1",
       "Value2":"2"
      },
      {
       "Value1":"3",
       "Value2":"4"
       }
     ]
 }

C# Model:

    public class ObjectFromJSON
     {
         public string Name;
         public InnerObject[] InnerObjects;
     }
 
    [Serializable] //This attribute includes it in the JSONUtility deserialisation
     public class InnerObject
     {
         public string Value1;
         public string Value2;
     }

C# Unity JSONUtility deserialisation

     ObjectFromJSON obj = JsonUtility.FromJson<ObjectFromJSON>(jsonMetadataString);

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How do I go about deserializing a json array?

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