I am facing this problem which i can not find a solution for inside my sharepoint farm 2013 on-premises. now i have a security group named "Users & Workers" and inside my javascript i am querying this security group, as follow:-

/_api/web/sitegroups/getbyname('User & Workers')/users/ 

but i am getting this error:-

A potentially dangerous Request.Path value was detected from the client (&).

i think the problem is related to the face that the group name contain this charecter &. so is there a way to fix this ?

here is my javascript code which is responsible to do the call:-

url = "/_api/web/sitegroups/getbyname(" + "'" + FieldValue + "')/users/";
     url: url,
     method: "GET",
     async: false,
     headers: { "Accept": "application/json; odata=verbose" },
     success: function (data) {

where the FieldValue will be equal to User & Workers

here is the code from firefox F12 tools:-

GET http://t*******/_api/web/sitegroups/getbyname('Users%20&%20Workers')/users/

400 Bad Request
jquery-1.10.2.js (line 8720)
"NetworkError: 400 Bad Request -
  • 2
    I have same problem with asterisk(*) - replacing it with %2a doesn't help
    – Serhiy
    Jun 22, 2017 at 8:54

2 Answers 2


There is an issue with & SharePoint on premises some rest api call. I have tested your scenario and I could achieve with different query

var groupName = encodeURIComponent(groupName);
_spPageContextInfo.webAbsoluteUrl + "/_api/web/sitegroups?$filter=Title eq '" + groupName + "'"


var groupName = encodeURIComponent(groupName);
_spPageContextInfo.webAbsoluteUrl + "/_api/web/sitegroups?$filter=LoginName eq '" + groupName + "'"

My example is as follows

//my groups is "Owners & Members"
http://sp-2013ent:1111/_api/web/sitegroups?$filter=LoginName eq 'Owners%20%26%20Members'

This is 100% working on 2013/2016 on-premises servers

Get Id from above call and use for your next calls to get users. Example as below


I know this requires additional call but solves your problem

  • thanks for your answer, will try this .. but i can not understand why you are doing substringof inside the filter ? one time you used LoginName the other you used Title ..
    – John John
    Jun 2, 2017 at 9:17
  • second question also when i do the following call "/_api/web/sitegroups inside my RESTClient tool, the security group will have the following values <d:LoginName>Users &amp; Workers</d:LoginName> <d:Title>Users &amp; Workers</d:Title> so i am not sure why the Title and LoginName will have amp; inside them...
    – John John
    Jun 2, 2017 at 9:23
  • I got failed when I put Title eq 'Owners %26 Members' but you can try that first it works you can use that. The LoginName and Title work same I have give LoginName just to match your call getByName rest call. The & is an XML compliant character so it will always be converted to &amp; Jun 2, 2017 at 13:00
  • 2
    I have tested query again with eq filter surprisingly it is working. I might have typo in query yesterday. So now you replace filter condition as $filter=Title eq 'Owners %26 Members'. It solves your problem. I am changing my answer also. Jun 2, 2017 at 13:19
  • 2
    Strangely the filter operation eq works case insensitive but when it comes to sitegroups it is working on case-sensitive. This might be an issue with REST API. In this case, you can force a user to type exact match string or need to find a way to give a dropdown with a list of groups prepopulated. Jun 6, 2017 at 16:30

You'll probably need to run the title through a url encoder so the REST API engine doesn't have a fit. Try this:

url = "/_api/web/sitegroups/getbyname(" + "'" + encodeURI(FieldValue) + "')/users/";

or you can do it to the entire URI.

  • 1
    but still i got the same exception ,, and inside my firefox F12 the url will be as follow Users%20&%20Workers.. so why the & is not being encoded ?
    – John John
    Jun 2, 2017 at 0:59
  • 1
    try encodeURIComponent(FieldValue)
    – Mike
    Jun 2, 2017 at 1:06
  • 1
    now using encodeURIComponent(FieldValue) the value will be as follow Users%20%26%20Workers so the & got encoded as %26 which is compatible with what is mentioned here prasannaadavi.com/2014/06/… but still i will be getting the same error.... looks to me like a bug in sharepoint rest api.. what do u think ?
    – John John
    Jun 2, 2017 at 1:23
  • 1
    I think there is no bug in the request. I am able to get my group and users which has been tested on SharePoint online site. https://xyz.sharepoint.com/_api/web/sitegroups/getByName('Owners%20%26%20Members')/users Jun 2, 2017 at 1:51
  • @VenkatKonjeti i am using sharepoint 2013 on-premise . and seems as mentoned on this link also sharepoint.stackexchange.com/questions/164673/… that users can not get this working on on-premises!! while on SP online seems it is working well..
    – John John
    Jun 2, 2017 at 2:04

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