How to turn off or handle camelCasing in JSON response ASP.NET Core?

How to turn off or handle camelCasing in JSON response ASP.NET Core?

By default, ASP.NET Core uses camelCasing for property names in JSON responses. If you want to turn off or handle camelCasing in JSON response, you can use the following approaches:

  • Turn off camelCasing globally: To turn off camelCasing globally for all JSON responses, you can add the following code to the ConfigureServices method in the Startup class:
services.AddControllers() .AddJsonOptions(options => { options.JsonSerializerOptions.PropertyNamingPolicy = null; });

This sets the PropertyNamingPolicy option to null, which disables the default camelCasing behavior.

  • Use custom naming policy: To use a custom naming policy for JSON responses, you can implement a custom naming policy and set it as the PropertyNamingPolicy option. For example, you can use JsonNamingPolicy.CamelCase to apply camelCasing to property names, or you can implement a custom policy that applies a different naming convention. Here's an example of a custom naming policy that uses snake_case:
public class SnakeCaseNamingPolicy : JsonNamingPolicy { public override string ConvertName(string name) { StringBuilder result = new StringBuilder(); bool lastCharWasUpper = false; for (int i = 0; i < name.Length; i++) { if (char.IsUpper(name[i])) { if (!lastCharWasUpper && i > 0) { result.Append('_'); } lastCharWasUpper = true; } else { lastCharWasUpper = false; } result.Append(char.ToLower(name[i])); } return result.ToString(); } } services.AddControllers() .AddJsonOptions(options => { options.JsonSerializerOptions.PropertyNamingPolicy = new SnakeCaseNamingPolicy(); });

This sets the PropertyNamingPolicy option to a new instance of the SnakeCaseNamingPolicy class, which converts property names to snake_case.

By using one of these approaches, you can turn off or handle camelCasing in JSON response in ASP.NET Core.

Examples

  1. "ASP.NET Core disable camelCasing in JSON response"

    • Description: Learn how to disable camelCasing for JSON responses in ASP.NET Core.
    // Disable camelCasing in JSON response globally services.AddMvc().AddJsonOptions(options => options.JsonSerializerOptions.PropertyNamingPolicy = null);

    This code snippet disables camelCasing globally for all JSON responses by setting the PropertyNamingPolicy to null in the JsonOptions.

  2. "ASP.NET Core disable camelCasing for specific controller"

    • Description: Explore how to disable camelCasing for JSON responses for a specific controller in ASP.NET Core.
    // Disable camelCasing for a specific controller [Produces("application/json")] [ApiController] [JsonArrayContract(NamingStrategyType = typeof(DefaultNamingStrategy))] public class MyController : ControllerBase { // Controller actions }

    This code snippet uses the JsonArrayContract attribute to specify the naming strategy for a specific controller, in this case, using the DefaultNamingStrategy.

  3. "ASP.NET Core custom JSON serializer settings to disable camelCasing"

    • Description: Learn how to use custom JSON serializer settings to disable camelCasing in ASP.NET Core.
    // Custom JSON serializer settings to disable camelCasing services.AddMvc().AddJsonOptions(options => { options.JsonSerializerOptions.PropertyNamingPolicy = null; // Add other custom settings if needed });

    This code snippet demonstrates the use of custom JSON serializer settings to disable camelCasing globally, allowing additional customization if required.

  4. "ASP.NET Core disable camelCasing with Newtonsoft.Json"

    • Description: Explore how to disable camelCasing for JSON responses using Newtonsoft.Json in ASP.NET Core.
    // Disable camelCasing with Newtonsoft.Json services.AddMvc().AddNewtonsoftJson(options => { options.SerializerSettings.ContractResolver = new DefaultContractResolver(); });

    This code snippet configures Newtonsoft.Json to use DefaultContractResolver, preventing camelCasing for JSON responses.

  5. "ASP.NET Core disable camelCasing per property"

    • Description: Learn how to disable camelCasing for specific properties in JSON responses in ASP.NET Core.
    // Disable camelCasing per property [JsonProperty("MyProperty", NamingStrategyType = typeof(DefaultNamingStrategy))] public string MyProperty { get; set; }

    This code snippet uses the JsonProperty attribute with a specified naming strategy to disable camelCasing for a specific property.

  6. "ASP.NET Core disable camelCasing for Web API"

    • Description: Explore how to disable camelCasing for Web API JSON responses in ASP.NET Core.
    // Disable camelCasing for Web API services.AddControllers().AddJsonOptions(options => { options.JsonSerializerOptions.PropertyNamingPolicy = null; });

    This code snippet configures the JSON options specifically for Web API controllers to disable camelCasing.

  7. "ASP.NET Core handle camelCasing with ActionFilter"

    • Description: Learn how to use an ActionFilter to handle camelCasing for JSON responses in ASP.NET Core.
    // Handle camelCasing with ActionFilter public class CamelCasePropertyNamesActionFilter : ActionFilterAttribute { public override void OnResultExecuting(ResultExecutingContext context) { if (context.Result is ObjectResult objectResult) { objectResult.Formatters.Add(new SystemTextJsonOutputFormatter(new JsonSerializerOptions { PropertyNamingPolicy = null })); } } }

    This code snippet demonstrates the use of an ActionFilter to customize the JSON serialization options, disabling camelCasing for the response.

  8. "ASP.NET Core disable camelCasing for SignalR"

    • Description: Explore how to disable camelCasing for JSON responses in ASP.NET Core SignalR.
    // Disable camelCasing for SignalR services.AddSignalR().AddJsonProtocol(options => { options.PayloadSerializerOptions.PropertyNamingPolicy = null; });

    This code snippet configures the JSON protocol options for SignalR to disable camelCasing.

  9. "ASP.NET Core disable camelCasing for specific property globally"

    • Description: Learn how to globally disable camelCasing for a specific property in JSON responses in ASP.NET Core.
    // Disable camelCasing for a specific property globally services.AddMvc().AddJsonOptions(options => { options.JsonSerializerOptions.Converters.Add(new MyPropertyConverter()); });

    This code snippet adds a custom converter for a specific property globally, allowing fine-grained control over its serialization.

  10. "ASP.NET Core handle camelCasing with JsonNamingPolicy"

    • Description: Explore how to use a custom JsonNamingPolicy to handle camelCasing for JSON responses in ASP.NET Core.
    // Handle camelCasing with custom JsonNamingPolicy public class NoCamelCaseNamingPolicy : JsonNamingPolicy { public override string ConvertName(string name) => name; } 
    // Register custom JsonNamingPolicy services.AddMvc().AddJsonOptions(options => { options.JsonSerializerOptions.PropertyNamingPolicy = new NoCamelCaseNamingPolicy(); });

    This code snippet defines a custom JsonNamingPolicy to disable camelCasing and registers it with the JSON options.

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