JSON Serialization and Deserialization in C# with Extension Method

Starting its 3.5 framework, .Net has already support JSON object serialization from System.Web.Script.Serialization.JavaScriptSerializer namespace.

Please note that the code below is an extension method to add ToJson() method to my object.

public static class JsonExtensionMethod
    public static string ToJson(this object o)
        System.Web.Script.Serialization.JavaScriptSerializer jsonSerializer = new System.Web.Script.Serialization.JavaScriptSerializer();

        return jsonSerializer.Serialize(o);

    public static T FromJson<T>(this string s)
        System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();

        return serializer.Deserialize<T>(s);

The usage is pretty simple and straight-forward. All we need to do is create JavaScriptSerializer instance and call its Serialize method. The method takes object type as its parameter which mean, you can pass all types that derive from System.Object.

To deserialize it, we use Deserialize method of JavaScriptSerializer class.

According to Scott Gu’s post, System.Web.Script.Serialization.JavaScriptSerializer is obsoleting, but will still be available in few versions to come.

Beside System.Web.Script.Serialization.JavaScriptSerializer, you also can use new System.Runtime.Serialization.DataContractJsonSerializer class


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