How to convert string to JsonResult

In this example, jsonString is a JSON-formatted string, and it will be returned as a JSON response to the client.

public JsonResult GetJsonResult()
{
    string jsonString = "{\"name\":\"Lucy\", \"age\":27, \"city\":\"New York\"}";
    return Json(jsonString, JsonRequestBehavior.AllowGet);
}

If you need to serialize an object into a JSON string and return it. You can create an object, serialize it to JSON, and then return it as a JsonResult:

public JsonResult GetJsonResult()
{
    var data = new { name = "Lucy", age = 27, city = "New York" };
    return Json(data, JsonRequestBehavior.AllowGet);
}

In this case, the anonymous object data is automatically serialized to JSON and returned as a JSON response.

In ASP.NET Core Web API, you can directly return a JSON response without explicitly using JsonResult.

For example:

[HttpGet]
public IActionResult GetJsonResult()
{
    var data = new { name = "Lucy", age = 27, city = "New York" };    
    return Ok(data);  // This will automatically be serialized to JSON
}

If you are working with a raw JSON string and want to return it, just wrap it in a ContentResult:

For example:

public IActionResult GetRawJsonString()
{
    string jsonString = "{\"name\":\"Lucy\", \"age\":27, \"city\":\"New York\"}";
    return Content(jsonString, "application/json");
}

You can also deserialize into a specific class or a strongly-typed object, like this:

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
    public string City { get; set; }
}

Here's how you can return a string or an object as JSON in C#

[HttpGet]
public IActionResult GetJsonResult()
{
    var person = new Person() { Name = "John", Age = 27, City = "New York" };    
    return Ok(person);
}