Question 196619 in Json Question posted in
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asp.net core controller – Return string as valid json

[HttpPost]
[Route("[action]")]
public string GetString()
{
    return "abc";
}

When I use the method above in an asp.net core controller the result is not formatted as json and the content type is text/plain. While every non-primitive result type is indeed formatted as json. How can I achive the same for string as return type?

Tags:

3

Answers


  1. 0

    You can wrap it in an Ok ActionResult.

    [HttpPost]
[Route("[action]")]
public ActionResult<string> GetString()
{
    return Ok("abc");
}

    (It might work without the Ok as we also changed the return type to ActionResult<string>)

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  2. 0

    Your return value is not a valid json, but you can do the following to change the content type only

    public class TestController : ControllerBase
{
    [HttpPost]
    [Route("[action]")]
    public IActionResult GetString()
    {
        return new JsonResult("abc");
    }
}

    Or you can inherit from Controller instead of ControllerBase

    public class TestController : Controller
{
    [HttpPost]
    [Route("[action]")]
    public IActionResult GetString()
    {
        return Json("abc");
    }
}
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  3. 0

    your "abc" is not valid json string and it doesnt make any sense to return an invalid json string as a json content.

    but if you want to return as an action output a valid json string, for example

    var jsonString = "["abc"]";

//or
var jsonString = "{"name":"abc"}";

    you can use this syntax

    return Content(jsonString, "application/json");

    or if you use a minimal API

     return Results.Content(jsonString, "application/json");
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