3 Answers Sorted by: 51 You should try using [EnumMember] instead of [Display]. The built-in JsonStringEnumConverter can deserialize string values as well. For more comprehensive documentation . Nice! The following example shows deserialization using CamelCase: C# using System.Text.Json.Serialization; . A new string representing the calling string converted to lower case. Examples. So if the service returns a value like someenumvalue you should use it like this in the enum Someenumvalue. Then, by using the attribute, we set the property name to something different than it is in the class definition. Does JsonStringEnumConverter (System.Text.Json) support null values? NEW. Json String Enum Converter (Json Naming Policy, Boolean) Initializes an instance of the JsonStringEnumConverter class with a specified naming policy and a value that indicates whether undefined . /// </param> public JsonStringEnumConverter ( JsonNamingPolicy? We just launched var hm = require ('header-metadata'); //Function for traversing through JSON tree. For example if you wanted to serialize the Gender property of a person as a string you could have defined the entity like this . Serialize and deserialize enum as string with System.Text.Json. //Temporary object for storing traverse results. The toLowerCase () method does not change the original string. Change JSON settings at the action level (serialization only) Option 1 - Return JsonResult. Description. var settings=options.SerializerSettings; // do something with settings. services .AddControllers() .AddNewtonsoftJson() .AddJsonOptions(options => { options.JsonSerializerOptions.Converters . All we have to do is decorate our property with a special attribute. If you prefer SomeEnumValue you should use the EnumMember attribute. However, there is a solution by using your own custom converter. So to handle string values in API payload, you have to set string enum converter. However, using JsonConveter attribute it is not possible to do this, unless you create another converter which sets that by default. JsonNamingPolicy as CamelCase There is a JsonConverterAttribute available for specifying this on the property and also a prewritten StringEnumConverter but I need to specify the CamelCaseNamingStrategy on that converter but I can't work out the syntax. JsonStringEnumConverter (JsonNamingPolicy, Boolean) Initializes an instance of the JsonStringEnumConverter class with a specified naming policy and a value that indicates whether undefined enumeration values are allowed. A few different wasy to achive the same goal. string strStartupPath = System.IO.Path.GetDirectoryName (System.Diagnostics.Process . When true, if an enum value isn't /// defined it will output as a number rather than a string. An important step is to add the System.Text.Json.Serialization namespace, so that we can use the attributes. A converter is a class that converts an object or a value to and from JSON. You can control this behavior by specifying the format while hooking up the converter to the serializer JsonSerializerOptions options = new JsonSerializerOptions { Converters = { new JsonStringEnumConverter ( JsonNamingPolicy.CamelCase) }, }; And now, the output will be You would attach can attach it to your property by . AddJsonOptions (option => option.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase); This produces below JSON response which is Camel Case by default. To do that, you need to use the StringEnumConverter class. It doesn't support other naming policies, such as snake case. Option 2 - Directly use JsonSerializer. See Also: The toUpperCase () Method The toLocaleLowerCase () Method The toLocaleUpperCase () Method Syntax string .toLowerCase () Parameters NONE Return Value Browser Support EnumConverterOptions. Initializes a new instance of the StringEnumConverter class. Using toLowerCase() console. The toLowerCase() method returns the value of the string converted to lower case. The solution. With JSon.Net we can define a custom ContractResolver to be able to serialize a C# object to a JSon with lowercase property names. public class MyModel { [JsonConverter(typeof(StringEnumConverter))] public MyEnum MyEnum { get; set; } } You will require two using statements to go along with this one : using Newtonsoft . public string GenerateJSon(MyObjectClass myObject) { return JsonConvert.SerializeObject(myObject, Formatting.None, new JsonSerializerSettings { ContractResolver = new LowercaseContractResolver() }); } private class LowercaseContractResolver . We assign the [JsonPropertyName] attribute to each property of the class. C# public JsonStringEnumConverter (System.Text.Json.JsonNamingPolicy? namingPolicy = null, bool allowIntegerValues = true) It is pretty common to specify that you want enum members to be camel cased. This also applies to more than just path params: query params, query maps, properties, etc, are all effected. Syntax public String toLowerCase() Parameters. Json String Enum Converter () Initializes an instance of the JsonStringEnumConverter class with the default naming policy that allows integer values. Unfortunately, there is currently no support "out-of-the-box" in System.Text.Json to convert nullable enums. Programming Language: C# (CSharp) Namespace/Package Name: Newtonsoft.Json.Converters. }); In my particular case I wanted to serialize enums as strings, not as integers. namingPolicy = null, bool allowIntegerValues = true) { _namingPolicy = namingPolicy; _converterOptions = allowIntegerValues ? layomia commented on Jun 7, 2021 Because of this they can run into an System.Text.Json.JsonException from d. [JsonConverter (typeof (StringEnumConverter))] public enum Status { [EnumMember (Value = "Awaiting Approval")] AwaitingApproval, Rejected, Accepted, } The same problem with a different tool. I'm in two minds about whether to silently start using an attribute, or whether to require the user to pass a format string. None. log ('ALPHABET'. The toLowerCase() method converts a string to lower case letters. Class/Type: StringEnumConverter. Assuming that "Icons/" is a path that's actually a subfolder of your application and contains your images, then construct your path first and assign the fully qualified filename, i.e: //Get the path of the executable (i.e., the main app-directory). So as we see above Camel Case behavior doesn't apply if the object casing changes like TemperatureCelcius used in the lower cases etc. This is very easy and can be done using String class toLowerCase () method which returns a new String after converting every character to the lowercase. The System.Text.Json namespace has built-in converters for most primitive types that map to JavaScript primitives. public JsonStringEnumConverter ( JsonNamingPolicy? Don't know if you solved this already, but in order to process all the keys you could do probably do something like the following GatewayScript sample: //Set the required libraries. Below is the syntax from java api documentation. Case sensitive deserialization - using System.Text.Json Case sensitive deserialization - using Newtonsoft Option 1 - Write a custom converter that ignores properties with mismatching casing Option 2 - Fork the Newtonsoft repository and change it to do case sensitive matching Example JSON with mismatching casing I am using the following JSON: Technical Details. Returns: A String value, representing the new string converted to lower case String Methods. You would need to convert all possible enum values to their serialized form using JsonNamingPolicy.ConvertName and could then simply look up the value you want to deserialize. (see below). You can also put the [JsonConverter] attribute on the enum itself. It works without a specified naming policy or with the CamelCase naming policy. I personally think that EnumMember should be supported, many users try to use it with the JsonStringEnumConverter that comes shipped with System.Text.Json itself. 2. The only limitation is that the naming policy actually assigns distinct names to all enum values. Definition and Usage The toLowerCase () method converts a string to lowercase letters. The property is an enumeration type and I wish the value to be serialised as the "lowercase version of the enumeration name". Note: The toUpperCase() method converts a string to upper case letters. StringEnumConverter (NamingStrategy, Boolean) Initializes a new instance of the . Use a custom converter. StringEnumConverter (Type) Initializes a new instance of the StringEnumConverter class. toLowerCase() does not affect the value of the string str itself. StringEnumConverter (Type, Object []) Initializes a new instance of the StringEnumConverter class. Json Assembly: System.Text.Json.dll Determines the naming policy used to convert a string-based name to another format, such as a camel-casing format. toLowerCase ()); // 'alphabet' Obsolete. namingPolicy = default, bool allowIntegerValues = true); In either case, there is a way to override the model serialization on a per class basis. You can rate examples to help us improve the quality of examples. function convertKeys (obj) {. Change JSON settings at the controller level (including deserialization) Step 1 - Create the custom converter. 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