The action results helper methods are based on ObjectResult. Built into the status code-specific action results returned from the helper methods.The default format used by ASP.NET Core is JSON. Content negotiationĬontent negotiation occurs when the client specifies an Accept header. For example, when returning different HTTP status codes based on the result of the operation. In the preceding code, the Content-Type returned is text/plain.įor actions with multiple return types, return IActionResult. To return plain text formatted data, use ContentResult and the Content helper:
The Accept header is ignored by the preceding code.
#Json to html formatter code#
Using the F12 browser developer tools or Postman with the previous code displays: The sample code returns a list of todo items. For more information, see Controller action return types in ASP.NET Core web API.īy default, the built-in helper method ControllerBase.Ok returns JSON-formatted data: Results from actions that return objects that aren't IActionResult types are serialized using the appropriate IOutputFormatter implementation. ASP.NET Core supports any object return value. For example, returning JsonResult returns JSON-formatted data and returning ContentResult returns plain-text-formatted string data.Īn action isn't required to return any specific type. Actions can return results that always use a specified format, ignoring a client's request for a different format. Some action result types are specific to a particular format, such as JsonResult and ContentResult. ASP.NET Core MVC supports formatting response data, using specified formats or in response to a client's request.
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