.NET Core JSON Serialization Changes – Newtonsoft vs System.Text.Json

I’ve been using Microsoft .NET for a long time. I started my programming journey learning C# on .NET 1.0 right after it’s initial release. In that time I have only experienced a breaking change twice. Once with WCF configuration in my app.config, and recently with the JSON serialization (or deserialization, as it were). For those upgrading a .NET Core 2.x application to .NET Core 3.x, you’ll want to be aware of some changes in the defaults. Today let’s talk about .NET Core and how it handles JSON serialization (and deserialization).