lucasteles/JsonEnum

Json Convert helpers for C# Enums

JsonEnum

Converters to customize your enum serialization on System.Text.Json

Getting started

NuGet package available:

$ dotnet add package JsonEnum

Enum Converters

This library defines the following converters:

• JsonEnumStringConverter: Covert to enum case name as string
• JsonEnumDescriptionConverter: Convert to description attribute string
• JsonEnumMemberValueConverter: Convert to member value attribute string
• JsonEnumNumericStringConverter: Convert to numeric enum value as string
• JsonEnumNumericConverter: Convert to numeric enum value

For each converter there is:

• An named attribute like [JsonEnum(name)Converter] to set converters on properties or types
• A generic type JsonEnum(name)Converter<TEnum> to be used on specific type for JsonSerializeOptions.Converters.

Using [Description]

Add JsonEnumDescriptionConverter to your json options or using the attribute [JsonEnumDescription] on your type.

using System.Text.Json;
using System.Text.Json.Serialization;
using System.ComponentModel;

public enum MyEnum
{
    [Description("first_value")] Value1,
    [Description("second_value")] Value2,
}
public class Foo
{
    [JsonEnumDescription]
    public MyEnum Value { get; init; }
}

var foo = new Foo { Value = MyEnum.Value1 };

foo will be serialized to/from:

{
    "Value": "first_value"
}

EnumMember [Description]

Add JsonEnumDescriptionConverter to your json options or using the attribute [JsonEnumDescription] on your type.

using System.Text.Json;
using System.Text.Json.Serialization;
using System.Runtime.Serialization;

public enum MyEnum
{
    [EnumMember(Value = "first-value")] Value1,
    [EnumMember(Value = "second-value")] Value2,
}
public class Foo
{
    [JsonEnumMemberValue]
    public MyEnum Value { get; init; }
}

var foo = new Foo { Value = MyEnum.Value1 };

foo will be serialized to/from:

{
    "Value": "first-value"
}

EnumMember [Description]

Add JsonEnumDescriptionConverter to your json options or using the attribute [JsonEnumDescription] on your type.

using System.Text.Json;
using System.Text.Json.Serialization;
using System.Runtime.Serialization;

public enum MyEnum
{
    [EnumMember(Value = "first-value")] Value1,
    [EnumMember(Value = "second-value")] Value2,
}
public class Foo
{
    [JsonEnumMemberValue]
    public MyEnum Value { get; init; }
}

var foo = new Foo { Value = MyEnum.Value1 };

foo will be serialized to/from:

{
    "Value": "first-value"
}

Numeric string

Serialize enum as a string of the numeric value of the enum.

using System.Text.Json;
using System.Text.Json.Serialization;

public enum MyEnum
{
    Value1 = 10,
    Value2 = 20,
}
public class Foo
{
    [JsonEnumNumericString]
    public MyEnum Value { get; init; }
}

var foo = new Foo { Value = MyEnum.Value1 };

foo will be serialized to/from:

{
    "Value": "10"
}

Numeric

This can be useful when you already have set a global converter on JsonSerializerOptions.Converters and need to override the behavior to numeric.

using System.Text.Json;
using System.Text.Json.Serialization;

public enum MyEnum
{
    Value1 = 10,
    Value2 = 20,
}
public class Foo
{
    [JsonEnumNumeric]
    public MyEnum Value { get; init; }
}

var foo = new Foo { Value = MyEnum.Value1 };

JsonSerializer.Serialize(foo, new JsonSerializerOptions()
{
    Converters = { new JsonEnumStringConverter() }, // will be ignored on Foo type
});

foo will be serialized to/from:

{
    "Value": 10
}

Swagger

If you are using Swashbuckle.AspNetCore you will notice that those attributes and converters are not respected by the swagger schema. You can use this nuget package to fix it:

$ dotnet add package JsonEnum.Swagger

And use the JsonEnumSchemaFilter on your swagger configuration:

services.AddSwaggerGen(options =>
{
    options.SchemaFilter<JsonEnumSchemaFilter>();
});