Add user to sharepoint group using REST API

Question

I am trying to add a user to sharepoint group with following code
serviceUrl= Appweb + "/_api/SP.AppContextSite(@target)/web/sitegroups("+GroupId+")/users?@target='host web'";
    $.ajax({
        url: serviceUrl,
        type: "POST",
        contentType: "application/json; charset=utf-8",
        dataType: 'json',
        body: "{'__metadata': { 'type': 'SP.User' },'LoginName':'i:0#.f|membership|'+email }",
  headers: {"accept":"application/json;odata=verbose",
    "content-type": "application/json;odata=verbose",
    "X-RequestDigest":$("#__REQUESTDIGEST").val()
    async: false,
  success: function (data) {
           alert('success');
  error: function (data) {
             alert('fail');
The request goes to error function. Response of the request is Microsoft.SharePoint.Client.InvalidClientQueryException and message is A node of type 'EndOfInput' was read from the JSON reader when trying to read the start of an entry. A 'StartObject' node was
expected
I tried the sample from following link but fail it
https://msdn.microsoft.com/en-us/library/office/dn531432.aspx

Answer 1

Hi,
Per my understanding, you might want to add an user to a SharePoint group in host web from a SharePoint Hosted App using REST API.
Here is a working demo for your reference:
var hostweburl;
var appweburl;
$(document).ready(function () {
//Get the URI decoded URLs.
hostweburl = decodeURIComponent(getQueryStringParameter("SPHostUrl"));
appweburl = decodeURIComponent(getQueryStringParameter("SPAppWebUrl"));
// Resources are in URLs in the form:
// web_url/_layouts/15/resource
var scriptbase = hostweburl + "/_layouts/15/";
// SP.RequestExecutor.js to make cross-domain requests
$.getScript(scriptbase + "SP.RequestExecutor.js", loadPage);
// Utilities
// Retrieve a query string value.
// For production purposes you may want to use a library to handle the query string.
function getQueryStringParameter(paramToRetrieve)
var params = document.URL.split("?")[1].split("&");
for (var i = 0; i < params.length; i = i + 1)
var singleParam = params[i].split("=");
if (singleParam[0] == paramToRetrieve) return singleParam[1];
function addUsersInGroup() {
var executor;
// Initialize the RequestExecutor with the app web URL.
executor = new SP.RequestExecutor(appweburl);
executor.executeAsync({
url: appweburl + "/_api/SP.AppContextSite(@target)/web/sitegroups(8)/users?@target='" + hostweburl + "'",
method: "POST",
contentType: "application/json; charset=utf-8",
dataType: 'json',
body: "{'__metadata': { 'type': 'SP.User' },'LoginName':'i:0#.f|membership|[email protected]'}",
headers: {
"Accept": "application/json; odata=verbose",
"content-type": "application/json;odata=verbose",
"X-RequestDigest":$("#__REQUESTDIGEST").val()
success: addUsersInGroupSuccessHandler,
error: addUsersInGroupErrorHandler
function addUsersInGroupSuccessHandler(data)
console.log(data);
var jsonObject = JSON.parse(data.body);
console.log(jsonObject);
function addUsersInGroupErrorHandler(data)
console.log(data);
var jsonObject = JSON.parse(data.body);
console.log(jsonObject);
Thanks 
Patrick Liang
TechNet Community Support
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