How to post Json data on server in query or ajax

You cant do direct service call to Web server from a jQuery application unless both your app and service is hosted in same service. For that you can add a proxy page to the project that can connect to service. Proxy can be an aspx page.

If Both Client and service in same server you can use code bellow:

var params = { //Add you parameters from your registration form here.
       "Paramete1": Parameter1,
       "Parameter2": Parameter2,
       "Parameter3": Parameter3,
   };
   $.ajax({
       type: "POST",
       url: "http://50.57.145.165:8180/FTPEReport/ftpereports/fsreport?fsReport=",
       async: true,
       cache: false,
       crossDomain: true,
       contentType: "application/json; charset=utf-8",
       dataType: 'json',
       data: JSON.stringify(params),
       success: function (data) {
           alert("Sucess");
       },
       error: function (xhr) {
           alert("Error");
       }
   });

If Both Client and server is in different server then(I am here using .net framework to create proxy.) add a new aspx file in to project. From js call this aspx page through service call. Here the aspx page name is "ServiceCall.aspx"

var data ={ //Add you parameters from your registration form here.
        "Paramete1": Parameter1,
        "Parameter2": Parameter2,
        "Parameter3": Parameter3,
    };
$.ajax({
        cache: true,
        type: "POST",
        async: true,
        dataType: "json",
        contentType: "application/json; charset=utf-8",
        url: "ServiceCall.aspx?ServiceType= POST",
        data: data,
        success: function (data) {
            alert("Sucess");
        },
        error: function (xhr) {
            alert("Error");
        }
    });
});

add the following code in ServiceCall.Cs Page

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Runtime.Serialization.Json;
using System.Text;
using System.Web;
using System.Web.Script.Serialization;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class ServerCall : System.Web.UI.Page
{
  
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    public override void ProcessRequest(HttpContext context)
    {
        var data = context.Request;
        var sr = new StreamReader(data.InputStream);
        var stream = sr.ReadToEnd();
        string type = HttpContext.Current.Request.QueryString["ServiceType"]; ;
        try
        {
            NetworkCredential credential = new NetworkCredential("username", "password"); // If servver need username and pass to authenticate
            HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("http://50.57.145.165:8180/FTPEReport/ftpereports/fsreport?fsReport=");
            httpWebRequest.Credentials = credential;
            httpWebRequest.ContentType = "application/json; charset=utf-8";
            httpWebRequest.Accept = "application/json";
            if (type == "GET")
            {
                httpWebRequest.Method = WebRequestMethods.Http.Get;
                var response = (HttpWebResponse)httpWebRequest.GetResponse();
                using (var twitpicResponse = (HttpWebResponse)httpWebRequest.GetResponse())
                {
                    using (var reader = new StreamReader(twitpicResponse.GetResponseStream()))
                    {
                        JavaScriptSerializer js = new JavaScriptSerializer();
                        var objText = reader.ReadToEnd();
                        HttpContext.Current.Response.Write(objText);
                        HttpContext.Current.ApplicationInstance.CompleteRequest();
                    }
                }
            }
            else
            {
                httpWebRequest.Method = WebRequestMethods.Http.Post;
                using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
                {
                    streamWriter.Write(stream);
                    streamWriter.Flush();
                    streamWriter.Close();
                }
                var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                using (var reader = new StreamReader(httpResponse.GetResponseStream()))
                {
                    JavaScriptSerializer js = new JavaScriptSerializer();
                    var objText = reader.ReadToEnd();
                    HttpContext.Current.Response.Write(objText);
                    HttpContext.Current.ApplicationInstance.CompleteRequest();
                }
            }
        }
        catch (Exception ex)
        {
           
        }

    }
}

Hope this helps
Happy Coding :-)