Serialize and deserialize enum as string with System.Text.Json

A few different wasy to achive the same goal. For more comprehensive documentation, refer to JSON in .NET.

Deserialize string value into enum

Attribute

use JsonConverter and JsonStringEnumConverter.

[JsonConverter(typeof(JsonStringEnumConverter))]
public enum AccountIdKind
{
    Iban = 1,
    Bban = 2
}

Configure in Startup

public void ConfigureServices(IServiceCollection services)
{
    ...
    services.AddControllers()
        .AddJsonOptions(x =>
        {
            x.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
        });

Serialize enum as string in Refit

services.AddSingleton(x =>
{
    var hostUrl = new Uri(configuration["Api:BaseUrl"]);
    var subscriptionKey = configuration["Api:SubscriptionKey"];
    var headerClientHandler = new HeaderClientHandler(subscriptionKey);

    var jsonSerializerOptions = new JsonSerializerOptions();
    jsonSerializerOptions.Converters.Add(new JsonStringEnumConverter(JsonNamingPolicy.CamelCase));
    return RestService.For<ILedgerApi>(
        new HttpClient(headerClientHandler) { BaseAddress = hostUrl },
        new RefitSettings(new SystemTextJsonContentSerializer(jsonSerializerOptions))
    );
});