Getting error “entries is not a function” when trying .entries() on an Object [closed]

I’m attempting to iterate through all the entries in an Object.

All the how-to guides seem to suggest using Object.entries() but I’m getting an error that no such function exists.

I’m initially forming the object as a PHP array from an SQL DB, then dumping the PHP array into Javascript Object using:

<script type="javascript">var libr = <?php echo json_encode($library); ?>;</script>

I’ve added a screenshot showing the object’s structure in a console window, and the specific error when I attempt to call .entries() on it:

What am I missing?