SystemTextJsonDeserialize

SystemTextJson is the default JSON serializer and deserializer in .NET Core 3.0 and later, developed by Microsoft. It is designed to be a high-performance, lower-allocation alternative to Newtonsoft.Json, which was previously the de facto standard for JSON handling in the .NET ecosystem. System.Text.Json is built directly into the .NET runtime, meaning no external package installation is required for most .NET applications.

The primary goals of SystemTextJson are speed and memory efficiency. It achieves this through a UTF-8-first approach, processing JSON directly from UTF-8 bytes without intermediate string allocations where possible. This makes it particularly well-suited for scenarios where performance and resource utilization are critical, such as web APIs and microservices.

Key features of SystemTextJson include support for serialization and deserialization of common .NET types, including POCOs (Plain Old CLR Objects), dictionaries, and collections. It offers a degree of customization through attributes like JsonPropertyName and JsonIgnore, and provides options for configuring serialization behavior, such as controlling case formatting, handling null values, and specifying encoding. While it aims for broad compatibility, it may not support all the advanced features or edge cases found in more mature libraries like Newtonsoft.Json. For developers migrating from Newtonsoft.Json, there is a compatibility pack available to ease the transition.