<PackageReference Include="System.Text.Json" Version="5.0.0-preview.4.20251.6" />

---

API Differences between 5.0.0-preview.4.20251.6 and 9.0.3

5 Additions 183 Removals

System.Runtime.InteropServices

• public static class JsonMarshal

System.Text.Json

• public struct JsonElement
  • public static bool DeepEquals(JsonElement element1, JsonElement element2)
  • public static JsonElement ParseValue(ref Utf8JsonReader reader)
  • public static bool TryParseValue(ref Utf8JsonReader reader, out Nullable element)
  • public int GetPropertyCount()
• public struct JsonEncodedText : IEquatable<JsonEncodedText>
  • public string Value { get; }
• public abstract class JsonNamingPolicy
  • public static JsonNamingPolicy KebabCaseLower { get; }
  • public static JsonNamingPolicy KebabCaseUpper { get; }
  • public static JsonNamingPolicy SnakeCaseLower { get; }
  • public static JsonNamingPolicy SnakeCaseUpper { get; }
• public struct JsonReaderOptions
  • public bool AllowMultipleValues { get; set; }
• public static class JsonSerializer
  • public static bool IsReflectionEnabledByDefault { get; }
  • public static TValue Deserialize<TValue>(JsonDocument document, JsonSerializerOptions options = null)
  • public static object Deserialize(JsonDocument document, Type returnType, JsonSerializerOptions options = null)
  • public static TValue Deserialize<TValue>(JsonDocument document, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static object Deserialize(JsonDocument document, JsonTypeInfo jsonTypeInfo)
  • public static object Deserialize(JsonDocument document, Type returnType, JsonSerializerContext context)
  • public static TValue Deserialize<TValue>(JsonElement element, JsonSerializerOptions options = null)
  • public static object Deserialize(JsonElement element, Type returnType, JsonSerializerOptions options = null)
  • public static TValue Deserialize<TValue>(JsonElement element, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static object Deserialize(JsonElement element, JsonTypeInfo jsonTypeInfo)
  • public static object Deserialize(JsonElement element, Type returnType, JsonSerializerContext context)
  • public static TValue Deserialize<TValue>(JsonNode node, JsonSerializerOptions options = null)
  • public static object Deserialize(JsonNode node, Type returnType, JsonSerializerOptions options = null)
  • public static TValue Deserialize<TValue>(JsonNode node, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static object Deserialize(JsonNode node, JsonTypeInfo jsonTypeInfo)
  • public static object Deserialize(JsonNode node, Type returnType, JsonSerializerContext context)
  • public static TValue Deserialize<TValue>(ReadOnlySpan<byte> utf8Json, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static object Deserialize(ReadOnlySpan<byte> utf8Json, JsonTypeInfo jsonTypeInfo)
  • public static object Deserialize(ReadOnlySpan<byte> utf8Json, Type returnType, JsonSerializerContext context)
  • public static TValue Deserialize<TValue>(Stream utf8Json, JsonSerializerOptions options = null)
  • public static object Deserialize(Stream utf8Json, Type returnType, JsonSerializerOptions options = null)
  • public static TValue Deserialize<TValue>(Stream utf8Json, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static object Deserialize(Stream utf8Json, JsonTypeInfo jsonTypeInfo)
  • public static object Deserialize(Stream utf8Json, Type returnType, JsonSerializerContext context)
  • public static TValue Deserialize<TValue>(ReadOnlySpan<char> json, JsonSerializerOptions options = null)
  • public static object Deserialize(ReadOnlySpan<char> json, Type returnType, JsonSerializerOptions options = null)
  • public static TValue Deserialize<TValue>(string json, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static TValue Deserialize<TValue>(ReadOnlySpan<char> json, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static object Deserialize(string json, JsonTypeInfo jsonTypeInfo)
  • public static object Deserialize(ReadOnlySpan<char> json, JsonTypeInfo jsonTypeInfo)
  • public static object Deserialize(string json, Type returnType, JsonSerializerContext context)
  • public static object Deserialize(ReadOnlySpan<char> json, Type returnType, JsonSerializerContext context)
  • public static TValue Deserialize<TValue>(ref Utf8JsonReader reader, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static object Deserialize(ref Utf8JsonReader reader, JsonTypeInfo jsonTypeInfo)
  • public static object Deserialize(ref Utf8JsonReader reader, Type returnType, JsonSerializerContext context)
  • public static ValueTask<TValue> DeserializeAsync<TValue>(Stream utf8Json, JsonTypeInfo<TValue> jsonTypeInfo, CancellationToken cancellationToken = default)
  • public static ValueTask<object> DeserializeAsync(Stream utf8Json, JsonTypeInfo jsonTypeInfo, CancellationToken cancellationToken = default)
  • public static ValueTask<object> DeserializeAsync(Stream utf8Json, Type returnType, JsonSerializerContext context, CancellationToken cancellationToken = default)
  • public static IAsyncEnumerable<TValue> DeserializeAsyncEnumerable<TValue>(Stream utf8Json, JsonSerializerOptions options = null, CancellationToken cancellationToken = default)
  • public static IAsyncEnumerable<TValue> DeserializeAsyncEnumerable<TValue>(Stream utf8Json, bool topLevelValues, JsonSerializerOptions options = null, CancellationToken cancellationToken = default)
  • public static IAsyncEnumerable<TValue> DeserializeAsyncEnumerable<TValue>(Stream utf8Json, JsonTypeInfo<TValue> jsonTypeInfo, CancellationToken cancellationToken = default)
  • public static IAsyncEnumerable<TValue> DeserializeAsyncEnumerable<TValue>(Stream utf8Json, JsonTypeInfo<TValue> jsonTypeInfo, bool topLevelValues, CancellationToken cancellationToken = default)
  • public static void Serialize<TValue>(Stream utf8Json, TValue value, JsonSerializerOptions options = null)
  • public static void Serialize(Stream utf8Json, object value, Type inputType, JsonSerializerOptions options = null)
  • public static void Serialize<TValue>(Stream utf8Json, TValue value, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static void Serialize(Stream utf8Json, object value, JsonTypeInfo jsonTypeInfo)
  • public static void Serialize(Stream utf8Json, object value, Type inputType, JsonSerializerContext context)
  • public static string Serialize<TValue>(TValue value, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static string Serialize(object value, JsonTypeInfo jsonTypeInfo)
  • public static string Serialize(object value, Type inputType, JsonSerializerContext context)
  • public static void Serialize<TValue>(Utf8JsonWriter writer, TValue value, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static void Serialize(Utf8JsonWriter writer, object value, JsonTypeInfo jsonTypeInfo)
  • public static void Serialize(Utf8JsonWriter writer, object value, Type inputType, JsonSerializerContext context)
  • public static Task SerializeAsync<TValue>(Stream utf8Json, TValue value, JsonTypeInfo<TValue> jsonTypeInfo, CancellationToken cancellationToken = default)
  • public static Task SerializeAsync(Stream utf8Json, object value, JsonTypeInfo jsonTypeInfo, CancellationToken cancellationToken = default)
  • public static Task SerializeAsync(Stream utf8Json, object value, Type inputType, JsonSerializerContext context, CancellationToken cancellationToken = default)
  • public static Task SerializeAsync<TValue>(PipeWriter utf8Json, TValue value, JsonTypeInfo<TValue> jsonTypeInfo, CancellationToken cancellationToken = default)
  • public static Task SerializeAsync<TValue>(PipeWriter utf8Json, TValue value, JsonSerializerOptions options = null, CancellationToken cancellationToken = default)
  • public static Task SerializeAsync(PipeWriter utf8Json, object value, JsonTypeInfo jsonTypeInfo, CancellationToken cancellationToken = default)
  • public static Task SerializeAsync(PipeWriter utf8Json, object value, Type inputType, JsonSerializerContext context, CancellationToken cancellationToken = default)
  • public static Task SerializeAsync(PipeWriter utf8Json, object value, Type inputType, JsonSerializerOptions options = null, CancellationToken cancellationToken = default)
  • public static JsonDocument SerializeToDocument<TValue>(TValue value, JsonSerializerOptions options = null)
  • public static JsonDocument SerializeToDocument(object value, Type inputType, JsonSerializerOptions options = null)
  • public static JsonDocument SerializeToDocument<TValue>(TValue value, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static JsonDocument SerializeToDocument(object value, JsonTypeInfo jsonTypeInfo)
  • public static JsonDocument SerializeToDocument(object value, Type inputType, JsonSerializerContext context)
  • public static JsonElement SerializeToElement<TValue>(TValue value, JsonSerializerOptions options = null)
  • public static JsonElement SerializeToElement(object value, Type inputType, JsonSerializerOptions options = null)
  • public static JsonElement SerializeToElement<TValue>(TValue value, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static JsonElement SerializeToElement(object value, JsonTypeInfo jsonTypeInfo)
  • public static JsonElement SerializeToElement(object value, Type inputType, JsonSerializerContext context)
  • public static JsonNode SerializeToNode<TValue>(TValue value, JsonSerializerOptions options = null)
  • public static JsonNode SerializeToNode(object value, Type inputType, JsonSerializerOptions options = null)
  • public static JsonNode SerializeToNode<TValue>(TValue value, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static JsonNode SerializeToNode(object value, JsonTypeInfo jsonTypeInfo)
  • public static JsonNode SerializeToNode(object value, Type inputType, JsonSerializerContext context)
  • public static byte[] SerializeToUtf8Bytes<TValue>(TValue value, JsonTypeInfo<TValue> jsonTypeInfo)
  • public static byte[] SerializeToUtf8Bytes(object value, JsonTypeInfo jsonTypeInfo)
  • public static byte[] SerializeToUtf8Bytes(object value, Type inputType, JsonSerializerContext context)
• public enum JsonSerializerDefaults
• public sealed class JsonSerializerOptions
  • public static JsonSerializerOptions Default { get; }
  • public static JsonSerializerOptions Web { get; }
  • public bool AllowOutOfOrderMetadataProperties { get; set; }
  • public JsonIgnoreCondition DefaultIgnoreCondition { get; set; }
  • public bool IgnoreReadOnlyFields { get; set; }
  • public bool IncludeFields { get; set; }
  • public char IndentCharacter { get; set; }
  • public int IndentSize { get; set; }
  • public bool IsReadOnly { get; }
  • public string NewLine { get; set; }
  • public JsonNumberHandling NumberHandling { get; set; }
  • public JsonObjectCreationHandling PreferredObjectCreationHandling { get; set; }
  • public ReferenceHandler ReferenceHandler { get; set; }
  • public bool RespectNullableAnnotations { get; set; }
  • public bool RespectRequiredConstructorParameters { get; set; }
  • public IJsonTypeInfoResolver TypeInfoResolver { get; set; }
  • public IList<IJsonTypeInfoResolver> TypeInfoResolverChain { get; }
  • public JsonUnknownTypeHandling UnknownTypeHandling { get; set; }
  • public JsonUnmappedMemberHandling UnmappedMemberHandling { get; set; }
  • public ReferenceHandling ReferenceHandling { get; set; }
  • public JsonSerializerOptions(JsonSerializerDefaults defaults)
  • public void AddContext<TContext>() where TContext : JsonSerializerContext
  • public JsonTypeInfo GetTypeInfo(Type type)
  • public void MakeReadOnly()
  • public void MakeReadOnly(bool populateMissingResolver)
  • public bool TryGetTypeInfo(Type type, out JsonTypeInfo typeInfo)
• public struct JsonWriterOptions
  • public char IndentCharacter { get; set; }
  • public int IndentSize { get; set; }
  • public int MaxDepth { get; set; }
  • public string NewLine { get; set; }
• public struct Utf8JsonReader
  • public bool ValueIsEscaped { get; }
  • public int CopyString(Span<byte> utf8Destination)
  • public int CopyString(Span<char> destination)
• public sealed class Utf8JsonWriter : IDisposable, IAsyncDisposable
  • public void WriteRawValue(string json, bool skipInputValidation = false)
  • public void WriteRawValue(ReadOnlySpan<char> json, bool skipInputValidation = false)
  • public void WriteRawValue(ReadOnlySpan<byte> utf8Json, bool skipInputValidation = false)
  • public void WriteRawValue(ReadOnlySequence<byte> utf8Json, bool skipInputValidation = false)

System.Text.Json.Nodes

• public sealed class JsonArray : JsonNode, IList<JsonNode>, ICollection<JsonNode>, IEnumerable<JsonNode>, IEnumerable
• public abstract class JsonNode
• public struct JsonNodeOptions
• public sealed class JsonObject : JsonNode, IDictionary<string, JsonNode>, ICollection<KeyValuePair<string, JsonNode>>, IEnumerable<KeyValuePair<string, JsonNode>>, IEnumerable, IList<KeyValuePair<string, JsonNode>>
• public abstract class JsonValue : JsonNode

System.Text.Json.Schema

• public static class JsonSchemaExporter
• public struct JsonSchemaExporterContext
• public sealed class JsonSchemaExporterOptions

System.Text.Json.Serialization

• public interface IJsonOnDeserialized
• public interface IJsonOnDeserializing
• public interface IJsonOnSerialized
• public interface IJsonOnSerializing
• public abstract class JsonConverter
  • public abstract Type Type { get; }
• public abstract class JsonConverter<T> : JsonConverter
  • public virtual bool HandleNull { get; }
  • public virtual T ReadAsPropertyName(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
  • public virtual void WriteAsPropertyName(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
• public class JsonDerivedTypeAttribute : JsonAttribute
• public enum JsonIgnoreCondition
  • WhenWritingDefault = 2
  • WhenWritingNull = 3
  • WhenNull = 1
• public enum JsonKnownNamingPolicy
• public sealed class JsonNumberEnumConverter<TEnum> : JsonConverterFactory where TEnum : struct, Enum
• public enum JsonNumberHandling
• public sealed class JsonNumberHandlingAttribute : JsonAttribute
• public enum JsonObjectCreationHandling
• public sealed class JsonObjectCreationHandlingAttribute : JsonAttribute
• public sealed class JsonPolymorphicAttribute : JsonAttribute
• public sealed class JsonPropertyOrderAttribute : JsonAttribute
• public sealed class JsonRequiredAttribute : JsonAttribute
• public sealed class JsonSerializableAttribute : JsonAttribute
• public abstract class JsonSerializerContext : IJsonTypeInfoResolver, IBuiltInJsonTypeInfoResolver
• public enum JsonSourceGenerationMode
• public sealed class JsonSourceGenerationOptionsAttribute : JsonAttribute
• public class JsonStringEnumConverter<TEnum> : JsonConverterFactory where TEnum : struct, Enum
• public class JsonStringEnumMemberNameAttribute : Attribute
• public enum JsonUnknownDerivedTypeHandling
• public enum JsonUnknownTypeHandling
• public enum JsonUnmappedMemberHandling
• public class JsonUnmappedMemberHandlingAttribute : JsonAttribute
• public abstract class ReferenceHandler
• public sealed class ReferenceHandler<T> : ReferenceHandler where T : ReferenceResolver
• public abstract class ReferenceResolver
• public sealed class ReferenceHandling
  • public static ReferenceHandling Default { get; }
  • public static ReferenceHandling Preserve { get; }

System.Text.Json.Serialization.Metadata

• public class DefaultJsonTypeInfoResolver : IJsonTypeInfoResolver, IBuiltInJsonTypeInfoResolver
• public interface IJsonTypeInfoResolver
• public sealed class JsonCollectionInfoValues<TCollection>
• public struct JsonDerivedType
• public static class JsonMetadataServices
• public sealed class JsonObjectInfoValues<T>
• public abstract class JsonParameterInfo
• public sealed class JsonParameterInfoValues
• public class JsonPolymorphismOptions
• public abstract class JsonPropertyInfo
• public sealed class JsonPropertyInfoValues<T>
• public abstract class JsonTypeInfo
• public sealed class JsonTypeInfo<T> : JsonTypeInfo
• public enum JsonTypeInfoKind
• public static class JsonTypeInfoResolver