REST API - Retrieve Group Members

Question

We are using SharePoint Online. I am planning to add a flow to send out an email notification whenever a new page is added to the site.

To do that, I need the list of members of that site cause I don't want to send it to everyone or anyone.

I am unable to retrieve the group members through REST API. When I fire the following REST call, I am getting the response as follows, but not the actual members and their email addresses

https://dhdigitalcoin.sharepoint.com/sites/OpenSourceTechTalk/_api/web/sitegroups/getbyname('Open%20Source%20Tech%20Talk%20Members')/users


<entry>
<id>https://dhdigitalcoin.sharepoint.com/sites/OpenSourceTechTalk/_api/Web/GetUserById(7)</id>
<category term="SP.User" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme"/>
<link rel="edit" href="Web/GetUserById(7)"/>
<link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/Alerts" type="application/atom+xml;type=feed" title="Alerts" href="Web/GetUserById(7)/Alerts"/>
<link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/Groups" type="application/atom+xml;type=feed" title="Groups" href="Web/GetUserById(7)/Groups"/>
<title/>
<updated>2019-06-03T12:47:56Z</updated>
<author>
<name/>
</author>
<content type="application/xml">
<m:properties>
<d:Id m:type="Edm.Int32">7</d:Id>
<d:IsHiddenInUI m:type="Edm.Boolean">false</d:IsHiddenInUI>
<d:LoginName>c:0o.c|federateddirectoryclaimprovider|92b9f118-885e-4c23-a103-de7ce46d7421</d:LoginName>
<d:Title>Open Source Tech Talk Members</d:Title>
<d:PrincipalType m:type="Edm.Int32">4</d:PrincipalType>
<d:Email>OpenSourceTechTalk@xxx.onmicrosoft.com</d:Email>
<d:Expiration/>
<d:IsEmailAuthenticationGuestUser m:type="Edm.Boolean">false</d:IsEmailAuthenticationGuestUser>
<d:IsShareByEmailGuestUser m:type="Edm.Boolean">false</d:IsShareByEmailGuestUser>
<d:IsSiteAdmin m:type="Edm.Boolean">false</d:IsSiteAdmin>
<d:UserId m:null="true"/>
<d:UserPrincipalName m:null="true"/>
</m:properties>
</content>
</entry>

Is there a way I can retrieve the actual members?

Am I taking the right approach towards building email notifications?

Answer 1

If you want to get all the users in your SharePoint site you can use :

/_api/web/siteusers?

Update:

Try using below endpoint to get the Site Members from Members group:

_api/Web/SiteGroups/GetByName('SiteName Members')/users

To get the specific property for user, you can add $select query as given below:

_api/Web/SiteGroups/GetByName('SiteName Members')/users?$select=Email,Id

You can get the following user properties using this endpoint:

1. Email
2. Groups
3. Id
4. IsHiddenInUI
5. IsSiteAdmin
6. LoginName
7. PrincipalType
8. Title
9. UserId

You can find everything related to Users, groups, and roles using REST API in below article(Must visit, this is a very helpful article): Users, groups, and roles using REST API.

Answer 2

You are getting back the actual users, just not their email address. You need to select Email, like:

_spPageContextInfo.webAbsoluteUrl + "/_api/web/sitegroups/getbyname('Open%20Source%20Tech%20Talk%20Members')/users?$select=Email"

This will get back a response like:

{
    value: [
        0: {
               Email: "mcsheaj@domain.com"
        },
        length: 2
    ]
}

assuming you set an accept header like:

headers: {
    'accept': 'application/json;odata=nometadata'
}

Answer 3

Just to keep an extra piece of information, since I can't add comments yet.

Here is a guide I have followed, which unfortunately though throws an error at some point due to mismatch between the JSON and the scheme.

[https://www.intelogy.co.uk/blog/assigning-microsoft-flow-approvals-to-sharepoint-groups/][1]

I think this can be solved by retrieving the JSON once and then pasting it to the Parser in order to re-create the correct schema, but following the solutions above (kudos to Joe McShea and Ganesh Sanap), as to pre-filter looking only for the email of users makes it way easier!

Just use the following as an HTTP GET request to Sharepoint:

_api/web/sitegroups/getbyname('Open%20Source%20Tech%20Talk%20Members')/users?$select=Email"

add the accept headers as mentioned above and use the following as a schema when you need to Parse the JSON

    {
    "type": "object",
    "properties": {
        "d": {
            "type": "object",
            "properties": {
                "results": {
                    "type": "array",
                    "items": {
                        "type": "object",
                        "properties": {
                            "__metadata": {
                                "type": "object",
                                "properties": {
                                    "id": {
                                        "type": "string"
                                    },
                                    "uri": {
                                        "type": "string"
                                    },
                                    "type": {
                                        "type": "string"
                                    }
                                }
                            },
                            "Email": {
                                "type": "string"
                            }
                        },
                        "required": [
                            "__metadata",
                            "Email"
                        ]
                    }
                }
            }
        }
    }
}
```

Then you can create an array with all the emails to use in your Approval. 

It works fine with a custom Sharepoint group in the site when members are added individually. 
I have not tested if you can invite AD groups and get the members too, if that's what you are looking for.


  [1]: https://www.intelogy.co.uk/blog/assigning-microsoft-flow-approvals-to-sharepoint-groups/