REST API, access document library's document properties

Question

Am quite new to REST API. Our is a SharePoint 2016 on premises environment. We have document library. This document library has a property of type 'Choice'. We added a document and set the value for choice column. Now we have to access the choice property value through REST API. We tried using below URL request in browser. It gives xml response and has Choice column value in it as;

<d:PropertyName>HR Dept</d:PropertyName>

http://websiteurl/_api/web/getFileByServerRelativeUrl('/root/test%20doc%20for%20PDF.pdf')/ListItemAllFields

Thus tried accessing the data through jquery

$.ajax(
    {
    url:"http://websitename/_api/web/getFileByServerRelativeUrl('/root/test%20doc%20for%20PDF.pdf')/ListItemAllFields",
    method:"GET",
    headers: {"Accept":"application/json; odata=verbose"},
    success: function(data){
    debugger;

    }
    }
    );

However not able to get required object details in the json response!

Kindly let know what we are missing / doing wrong.

Thank you

Answer 1

Googling got the resolution by appending the property name at the end of the URL

URL:

http://websitename/_api/web/getFileByServerRelativeUrl('/root/test%20doc%20for%20PDF.pdf')/ListItemAllFields/Propertyname

However would like to know how to get correct JSON object for All fields.