System.Text.Json (C# .NET Namespace)

System.Text.Json is a high-performance, low-allocation JSON library developed for the .NET ecosystem. Originally introduced by Microsoft as a modern alternative to Third-party libraries like Newtonsoft.Json, it was designed to leverage modern C# features to provide faster serialization and deserialization processes while minimizing memory usage. Since its debut in .NET Core 3.0, it has become the standard built-in tool for handling JSON data within web applications, cloud services, and desktop software.

The development and manufacturing of this software occur primarily through Microsoft's engineering teams based in the United States, with significant contributions from the global open-source community via GitHub. As a core component of the .NET platform, its lifecycle and updates are strictly managed by Microsoft, ensuring compatibility with evolving industry standards such as RFC 8259. Ownership of the brand and the underlying technology remains consolidated under Microsoft Corporation, which continues to integrate these tools into the broader Azure and .NET developer environments.