.NET MVC - Read Json Object From POST data

If you want to get JSON data posted to MVC endpoint without creating corresponding C# object, you can use the following method.

Web API endpoint

 [HttpPost]

        [Route("GetData")]

        public String GetData()

        {

            //Get the request input stream

            Stream req = Request.InputStream;

            req.Seek(0, System.IO.SeekOrigin.Begin);

            string jsonString = new StreamReader(req).ReadToEnd();

            //Convert JSON String to JObject

            JObject jsonObject = JObject.Parse(jsonString);

            //Get posted data

            string name= jsonObject["name"].ToString();

            return name;

        }

JavaScript call

            let jsonData = '{"name":"myname",age:10}';

            let reqPromise = fetch('/GetData',

                {

                    method: "POST",

                    body: jsonData,

                    headers: {

                        'Accept': 'application/json, text/plain, */*',

                        'Content-Type': 'application/json'

                    }

                });

            reqPromise.then(

                (response) => {

                    return response.text();

                }

            ).then((jsonRespnse) => {

                console.log(jsonRespnse);

                }

            );

The other option is to create corresponding C# object and accept it as a parameter in the endpoint.

1) Create object

    public class MyData

    {

        public String Name { get; set; }

        public int Age { get; set; }

    }

2) Accept the object as a parameter using [FromBody] attribute as given below

        [HttpPost]

        [Route("GetData")]

        public String GetData([System.Web.Http.FromBody] MyData myData)

        {

          return myData.Name;

        }