dotnet-core/release-notes/6.0/preview/api-diff/preview1/.Net/6.0-preview1_System.Text.Json.md

System.Text.Json

 namespace System.Text.Json {
     public readonly struct JsonElement {
+        public static JsonElement ParseValue(ref Utf8JsonReader reader);
+        public static bool TryParseValue(ref Utf8JsonReader reader, out JsonElement? element);
     }
     public static class JsonSerializer {
+        public static object Deserialize(ReadOnlySpan<char> json, Type returnType, JsonSerializerOptions options = null);
+        public static TValue Deserialize<TValue>(ReadOnlySpan<char> json, JsonSerializerOptions options = null);
     }
 }