How to get POST data in WebAPI?

From answer in this question:
How to get Json Post Values with asp.net webapi

1. Autoparse using parameter binding; note that the dynamic is made up of JToken, hence the .Value accessor.

   public void Post([FromBody]dynamic value) {
       var x = value.var1.Value; // JToken
   }
   

2. Read just like Request.RequestUri.ParseQueryString()[key]

   public async Task Post() {        
      dynamic obj = await Request.Content.ReadAsAsync<JObject>();
      var y = obj.var1;
   }
   

3. Same as #2, just not asynchronously (?) so you can use it in a helper method

   private T GetPostParam<T>(string key) {
       var p = Request.Content.ReadAsAsync<JObject>();
       return (T)Convert.ChangeType(p.Result[key], typeof(T)); // example conversion, could be null...
   }
   

Caveat — expects media-type application/json in order to trigger JsonMediaTypeFormatter handling.