ASP.Net MVC return Json as IActionResult modifies the object key names

Question

I have a class BasketItem:

public class BasketItem
{
    public long FoodId;
    public int Count;
}

I have a AddToBasket controller which adds items to basket and then returns the json value of BasketItem[]:

I'm using return Json(items); which items is of type BasketItem[].

The returned json is like:

[{"foodId":6,"count":1},{"foodId":5,"count":1},{"foodId":4,"count":1}]

while it Should be like:

[{"FoodId":6,"Count":1},{"FoodId":5,"Count":1},{"FoodId":4,"Count":1}]

How to prevent return Json from renaming the key names?

The default behavior in MVC is actually to return pascal-cased JSON since it uses JavaScriptSerializer under the hood unless something is overridden. There's no way to answer your question without additional details. — David L
– David L, Commented Mar 31, 2017 at 4:01
No, I don't think you do understand. Your returned json is actually camelCased, not PascalCased, which is atypical behavior for MVC. As a result, something in your code is currently overriding the default behavior and there's no way for us to tell you what it is because it is in your codebase. — David L
– David L, Commented Mar 31, 2017 at 4:07
And as an aside, camelCased is the industry preferred standard which is why a developer in your organization most likely set it up this way. — David L
– David L, Commented Mar 31, 2017 at 4:08

Ashkan Mobayen Khiabani · Accepted Answer · 2017-03-31 04:16:50Z

1

I solved the problem by using the overload of the Json(object, JsonSerializerSettings):

   var serializerSettings = new JsonSerializerSettings
        {
            ContractResolver = new DefaultContractResolver(),
        };
        return Json(items, serializerSettings);

answered Mar 31, 2017 at 4:16

Ashkan Mobayen Khiabani

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