I have to read values from two lookup fields. I am getting values with one of them but for the other it shows undefined.

        url:_spPageContextInfo.webAbsoluteUrl + "/_api/web/lists/GetByTitle('Certifications')/Items?$filter="+filterById+"&$select=Title,Subsystem/ID,Subsystem/Title,Belongs_x0020_To/Title,Belongs_x0020_To/ID&$expand=Subsystem,Belongs_x0020_To",
        type: "GET",     
        headers: {
            "accept": "application/json;odata=verbose",
        success: function (data) {
  • Which one is undefined Belongs_x0020_To or others? Nov 19, 2015 at 9:37
  • Pro tip, do a console.dir(data) in the success method to get the returned object printed to the console in for example Chrome. Then you can see how the object is composed Nov 19, 2015 at 9:40
  • data.d.results[0].Belongs_x0020_To.Title and data.d.results[0].Belongs_x0020_To.ID is undefined
    – KumarV
    Nov 19, 2015 at 9:42
  • 1
    I guess your $filter="+filterById+" is returning some null Belongs_x0020_To. Can you check it manually in the list @vikashkumar Nov 19, 2015 at 10:03
  • If it is null, i thought it should show null value bt it showed undefined. When I added some values to those columns then it worked.
    – KumarV
    Nov 19, 2015 at 10:32

2 Answers 2


For checking your internal names:

Goto the List\Library settings page listing all fields (also works on ContentType definition)

and run the F12 code:


I have it under a BookmarkLet link, ready to use in any site I browse to.

A Standard TASKS list logs:



I guess, that you just have the wrong column name (the naming in SharePint sometimes aapears a little chaotic). The best way is to give out the URL (via console.log() or alert() ) and than just display the result in the browser. There you can see how the fields are named.

If this won't help: If you want to access single fields of a lookup content type it sometimes just working if you integrate them in the column.

  • Go to List => List Settings => YourContentTypeColumn
  • Scroll down to "Add a column to show each of these additional fields"
  • Check the columns you you need to access

I have no idea why this sometimes is needed (and sometimes not).

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