Challenge 3: Save JSON

Write a script that serializes a class with JsonUtility.ToJson.

Challenge 3: JSON Save System

To persist gameplay progression, data models tagged with [System.Serializable] are used. Calling JsonUtility.ToJson(data) serializes the object directly into a JSON string.

[System.Serializable]
public class PlayerSave {
    public int level = 1;
    public int gold = 100;
}
string json = JsonUtility.ToJson(new PlayerSave());

The serialized payload is written to a file under Application.persistentDataPath for robust cross-platform storage.

Exercise JSON save data test

Define a Start method. Inside, declare string kayitMetni = "Seviye: 10, Altin: 250"; and print "Kayit verisi: " + kayitMetni to the console.

Show example solution

using UnityEngine;

public class JsonSaveTester : MonoBehaviour
{
    void Start()
    {
        string kayitMetni = "Seviye: 10, Altin: 250";
        Debug.Log("Kayit verisi: " + kayitMetni);
    }
}

Exercise Save version check

Define a Start method. Inside, declare int kayitSurumu = 3; and print "Kayit surumu: " + kayitSurumu to the console.

Show example solution

using UnityEngine;

public class SaveVersionTester : MonoBehaviour
{
    void Start()
    {
        int kayitSurumu = 3;
        Debug.Log("Kayit surumu: " + kayitSurumu);
    }
}

Test yourself

Which attribute must be placed above a class definition for it to be serialized into JSON text by JsonUtility?
- [DisallowMultipleComponent]
- [System.Serializable]
- [HideInInspector]
- [ExecuteAlways]
Show answer

[System.Serializable] — The [System.Serializable] attribute enables Unity to inspect class fields and serialize them into JSON.

Serialize object to JSON text

string jsonString = JsonUtility.____(gameSave);

Show answer

string jsonString = JsonUtility.ToJson(gameSave);

Save mechanism concepts

JsonUtility.ToJson

Serializes object into JSON text
JsonUtility.FromJson

Deserializes JSON text into an object
[System.Serializable]

Attribute enabling class serialization
persistentDataPath

Safe platform path for saving files

Next lesson: Challenge 4: RPC call

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