Try the new System.Text.Json APIs

For .NET Core 3.0, we’re shipping a brand new namespace called System.Text.Json with support for a reader/writer, a document object model (DOM), and a serializer. In this blog post, I’m telling you why we built it, how it works, and how you can try it.
— https://devblogs.microsoft.com/dotnet/try-the-new-system-text-json-apis/