JavaScriptSerializer is not allowed in .net core project?

In .net core the most common way of serializing and deserializing objects (JSON) using Newtonsoft.Json.

You need to install the Nuget Package of Newtonsoft.Json

add using a statement like:

using Newtonsoft.Json;

and use it as:

object o = JsonConvert.DeserializeObject(json1);
string json2 = JsonConvert.SerializeObject(o, Formatting.Indented);