SharePoint Rest API shows error for Author/FirstName' is not valid

Question

I have Rest API URL below:

https://DevSite/_api/web/lists/getbytitle('Test')/items?$select=AuthorId,Author/FirstName,Author/LastName,Author/Id,Author/EMail&$expand=Author

It is not working, it shows error:

The query to field 'Author/FirstName' is not valid.

I'm trying to get Author first and last name using REST API.

I have checked that there is items in list, everything is ok, still shows error

Answer 1

Refer below REST API URL :

https://DevSite/_api/web/lists/getbytitle('TestList')/items?$expand=Author&$select=Author/FirstName,Author/Id,Author/LastName