Web part list items count

Question

I have a list built using web part. I want count of that web part list.

Scenario:

I have List A. Created list B and added web part into it which points to list A.

I want list item count of list B.

I used '/_api/web/lists/GetByTitle('list B')/items'. But I am getting 0 as count though there are many items.

I don't want to return count of list A. So is there any approach to get count of web part list?

Code

function GetWebPartPageItems(ListName)
{
$.ajax({  
url:_spPageContextInfo.webAbsoluteUrl +"/_api/web/lists/GetByTitle('List B')?$select=ItemCount",
    type: "GET",  
    headers: {  
        "accept": "application/json;odata=verbose",  
        "content-Type": "application/json;odata=verbose"  
    },  
async:false,
    success: function(data) {  
        console.log(data.d.results);  
    },  
    error: function(error) {  
        alert(JSON.stringify(error));  
    }  
});  
}

When url is hit in browser,I get resopnse as:

<?xml version="1.0" encoding="utf-8"?><entry 
xml:base="http://sharepoint.brainvire.com/sites/DMS/_api/" xmlns="http://www.w3.org/2005/Atom" 
xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" 
xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" 
xmlns:georss="http://www.georss.org/georss" xmlns:gml="http://www.opengis.net/gml" m:etag="&quot;40&quot;"><id>http://sharepoint.brainvire.com/sites/DMS/_api/Web/Lists(guid'514f92fb-ccd7-497c-81b9-b74fc074ee37')</id><category term="SP.List" 
scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" /><link 
rel="edit" href="Web/Lists(guid'514f92fb-ccd7-497c-81b9-b74fc074ee37')" /><title />
<updated>2019-08-05T10:34:16Z</updated><author><name /></author>
<content type="application/xml"><m:properties><d:ItemCount m:type="Edm.Int32">0</d:ItemCount>
</m:properties></content></entry>

In list,items are present:

Answer 1

To get the List Item Count using REST API you need to use:

http://sitename/_api/web/lists/getbytitle('List Name')?$select=ItemCount

Where List Name is display name of your list (Not the list name in URL).

For more clarification check my answer given in below link:

SharePoint rest api not bringing items from List

Update:

From Image attached to your question, it seams that the display name of your list is "Pending For Approval". So try using below URL to get the item count:

http://sitename/_api/web/lists/getbytitle('Pending For Approval')?$select=ItemCount