Have a question about a user's unqiue id in SP2013: namely, how to get the current user's id via a Javascript REST call.

I have some lists that have a user lookup and the ID stored in this lookup is the same as in _spPageContextInfo.userId. However, when I do a REST call to https://[mysite]/_api/web/currentUser I get a different ID.

How do I make a REST call that would get me the same value as _spPageContextInfo.userId ?


_spPageContextInfo.userId === 540 // same value as in List columns

var g = $.ajax({
  url: "https://[mysite]/_api/web/currentUser",
  headers: {
    "Accept": "application/json; odata=verbose"

p.responseJSON.d.Id === 639  // this is different though 

// why is this?
_spPageContextInfo.userId !== p.responseJSON.d.Id
  • 1
    is [mysite] your current web or different web or site collection? – Aveenav Sep 15 '16 at 18:22

If you're using different web (or site) the user Id(s) will differ. Since _api is a virtual folder it can be called from any web. In your case, use the current web. See the snippet below:

window.console && console.info('spPageContextInfo user Id: ' + _spPageContextInfo.userId);

function getCurrentWebUrl() {
    var webUrl = _spPageContextInfo.webServerRelativeUrl;
    return webUrl.endsWith("/") ? webUrl : webUrl + "/";

var p = $.ajax({
    url: getCurrentWebUrl() + "_api/web/currentUser",
    headers: {
        "Accept": "application/json; odata=verbose"

p.done(function (data) {
    window.console && console.info('From ajax response: user Id ' + data.d.Id);
| improve this answer | |
  • Sorry for the super long delay but I got pulled into another project. Yes! Adding the sub-site to the URL fixed the issue. Thanks so much and glad it was so simple! – thornomad Oct 20 '16 at 17:05

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