Ensuring json keys are lowercase in .NET

Question

Is there simple way using JSON in .NET to ensure that the keys are sent as lower case?

At the moment I\'m using the newtonsoft\'s Json.NET library and simply using

Answer 1

you can use "JsonProperty":

Usage:

public class Authority
{
    [JsonProperty("userName")] // or [JsonProperty("username")]
    public string Username { get; set; }
    [JsonProperty("apiToken")] // or [JsonProperty("apitoken")]
    public string ApiToken { get; set; }
}

var json  = JsonConvert.SerializeObject(authority);

Answer 2

protected void Application_Start() {
    JsonConfig.Configure();   
}

public static class JsonConfig
{
    public static void Configure(){
        var formatters = GlobalConfiguration.Configuration.Formatters;
        var jsonFormatter = formatters.JsonFormatter;
        var settings = jsonFormatter.SerializerSettings;

        settings.ContractResolver = new CamelCasePropertyNamesContractResolver();
    }
}

Answer 3

For me I used a combination of some of the other answers and ended up with this

        return JsonConvert.SerializeObject(obj, Formatting.Indented, new JsonSerializerSettings
        {
            ContractResolver = new CamelCasePropertyNamesContractResolver()
        });

was closer to a solution to what I was looking for as I was not looking to create my own

Answer 4

In Json.NET 9.0.1 and later it is possible to ensure that all property names are converted to lowercase by using a custom NamingStrategy. This class extracts the logic for algorithmic remapping of property names from the contract resolver to a separate, lightweight object that can be set on DefaultContractResolver.NamingStrategy. Doing so avoids the need to create a custom ContractResolver and thus may be easier to integrate into frameworks that already have their own contract resolvers.

Define LowercaseNamingStrategy as follows:

public class LowercaseNamingStrategy : NamingStrategy
{
    protected override string ResolvePropertyName(string name)
    {
        return name.ToLowerInvariant();
    }
}

Then serialize as follows:

var settings = new JsonSerializerSettings
{
    ContractResolver = new DefaultContractResolver { NamingStrategy = new LowercaseNamingStrategy() },
};
string loginRequest = JsonConvert.SerializeObject(auth, settings);

Notes -

• Using string.ToLowerInvariant() ensures that the same contract is generated in all locales.

• To control whether overridden property names, dictionary keys and extension data names are lowercased, you can set NamingStrategy.OverrideSpecifiedNames, NamingStrategy.ProcessDictionaryKeys or NamingStrategy.ProcessExtensionDataNames (Json.NET 10.0.1 and later) to true.

• You may want to cache the contract resolver for best performance.

• If you do not have access to the serializer settings in your framework, you can apply a NamingStrategy directly to your object as follows:

  [JsonObject(NamingStrategyType = typeof(LowercaseNamingStrategy))]
  public class Authority
  {
      public string Username { get; set; }
      public string ApiToken { get; set; }
  }
  

• Do not modify the NamingStrategy of CamelCasePropertyNamesContractResolver. This contract resolver shares type information globally across all of its instances, and so modifying any one instance can have unexpected side effects.

Answer 5

You can create a custom contract resolver for this. The following contract resolver will convert all keys to lowercase:

public class LowercaseContractResolver : DefaultContractResolver
{
    protected override string ResolvePropertyName(string propertyName)
    {
        return propertyName.ToLower();
    }
}

Usage:

var settings = new JsonSerializerSettings();
settings.ContractResolver = new LowercaseContractResolver();
var json = JsonConvert.SerializeObject(authority, Formatting.Indented, settings);

Wil result in:

{"username":"Mark","apitoken":"xyzABC1234"}

---

If you always want to serialize using the LowercaseContractResolver, consider wrapping it in a class to avoid repeating yourself:

public class LowercaseJsonSerializer
{
    private static readonly JsonSerializerSettings Settings = new JsonSerializerSettings
    {
        ContractResolver = new LowercaseContractResolver()
    };

    public static string SerializeObject(object o)
    {
        return JsonConvert.SerializeObject(o, Formatting.Indented, Settings);
    }

    public class LowercaseContractResolver : DefaultContractResolver
    {
        protected override string ResolvePropertyName(string propertyName)
        {
            return propertyName.ToLower();
        }
    }
}

Which can be used like this:

var json = LowercaseJsonSerializer.SerializeObject(new { Foo = "bar" });
// { "foo": "bar" }

---

ASP.NET MVC4 / WebAPI

If you are using ASP.NET MVC4 / WebAPI, you can use a CamelCasePropertyNamesContractResolver from Newtonsoft.Json library which included by default.