Web API 2 Json Output in Lower Case and Underscore

Question

After the following JsonFormatter's ContractResolver configuration from PascalCase (default) to camel case, am getting the following Json Output in camel case.

But, I prefer to achieve the Json output in Lower Case along with underscore (the uppercase should be replaced with underscore). Any ideas? :)

protected void Application_Start()
{
    GlobalConfiguration.Configure(WebApiConfig.Register);

    EnableCamelCase();
}

private void EnableCamelCase()
{
    HttpConfiguration config = GlobalConfiguration.Configuration;
    config.Formatters.JsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
    config.Formatters.JsonFormatter.UseDataContractJsonSerializer = false;
}

Class Properties

public int MenuId { get; set; }
public byte TypeId { get; set; }
public string MenuName { get; set; }
public string Description { get; set; }
public string Tooltip { get; set; }
public byte? Minimum { get; set; }
public byte? Maximum { get; set; }
public bool CanMultiSelect { get; set; }
public byte SortOrder { get; set; }

Camel Case Json Output

"items": [
    {
      "menuId": 82,
      "typeId": 1,
      "menuName": "dsf",
      "description": "sdafsdafsd",
      "tooltip": null,
      "minimum": null,
      "maximum": null,
      "canMultiSelect": false,
      "sortOrder": 0
    },
    {
      "menuId": 83,
      "typeId": 1,
      "menuName": "sdfad",
      "description": "fsdfda",
      "tooltip": null,
      "minimum": null,
      "maximum": null,
      "canMultiSelect": false,
      "sortOrder": 0
    }
]}

Preferred Output

"items": [
    {
      "menu_id": 82,
      "type_id": 1,
      "menu_name": "dsf",
      "description": "sdafsdafsd",
      "tooltip": null,
      "minimum": null,
      "maximum": null,
      "can_multi_select": false,
      "sort_order": 0
    },
    {
      "menu_id": 82,
      "type_id": 1,
      "menu_name": "dsf",
      "description": "sdafsdafsd",
      "tooltip": null,
      "minimum": null,
      "maximum": null,
      "can_multi_select": false,
      "sort_order": 0
    }
]}

strickt01 · Accepted Answer · 2015-12-18 15:19:38Z

3

You'll need to create a custom ContractResolver that inherits from DefaultContractResolver. See the Newtonsoft documentation. You can then loop round the characters in the property name and insert the underscore/ make the character lowercase as appropriate.

answered Dec 18, 2015 at 15:19

strickt01

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Comments

Prabhu Manoharan · Accepted Answer · 2022-09-18 07:48:22Z

0

Nowadays you don't need a custom contract resolver, try with snake case:

    var settings = new JsonSerializerSettings {
      ContractResolver = new DefaultContractResolver {
        NamingStrategy = new SnakeCaseNamingStrategy()
      }
    };

answered Sep 18, 2022 at 7:48

Prabhu Manoharan

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