Serializable

Description

Indicates that a class or a struct can be serialized.

To enable serialization, apply the [Serializable] attribute. For more information on serialization, see Script Serialization.

This attribute is not required for classes that derive from serialized Unity classes, such as MonoBehaviour, ScriptableObject and ScriptedImporter.

Additional resources: NonSerialized, SerializeReference, SerializeField, JsonUtility.FromJson

The following example creates a custom PlayerStats struct and gives it the [Serializable] attribute, which makes it serializable. It then creates a private field of type PlayerStats, and applies the [SerializeField] attribute to it, to make it show up in the Inspector.

using System;
using UnityEngine;

public class Player : MonoBehaviour
{
    //Declare a custom struct.  The [Serializable] attribute ensures
    //that its content is included when the 'stats' field is serialized.
    [Serializable]
    public struct PlayerStats
    {
        public int movementSpeed;
        public int hitPoints;
        public bool hasHealthPotion;
    }

    //Use [SerializeField] attribute to ensure that the private field is serialized
    [SerializeField]
    private PlayerStats stats;
}