Improve startup and runtime throughput Reduce private bytes usage Improve IL (Intermediate Language) Linker friendliness by avoiding runtime reflection Efforts to utilize C# source generation in System.Text.Json were in a prototype stage as of mid-December. Microsoft envisions their coming to fruition in .NET 6.0, due in November of this year. The System.Text.Json library converts .NET object types to a JSON string and vice versa. It supports UTF-8 text encoding and was introduced in .NET Core 3.0. A type in the library, JsonSeralizer, purports to have the highest level of functionality for processing JSON data. In the new .NET 5, released in November, System.Text.Json gained improvements in performance and reliability, making the library easier to adopt for developers familiar with the Newtonsoft.Json framework.