add-pages-via-wp-rest-api.js

(function($) {
    let pages = [
        'Home',
        'About',
        'Contact'
        // whatever....
    ];

    function addPages(pageArray){
        // Create a page with the WordPress REST API
        let data = {};
        data.status = 'publish';
        data.type = 'page';
        
        pageArray.forEach(page => {
            data.title = page;
            data.content = `I am the ${page} content`; // just for sh!ts and giggles
            $.ajax({
                method: "POST",
                url: restapi_details.rest_url + 'wp/v2/pages', // getting data from wp_localize_script
                data: data,
                beforeSend: function ( xhr ) {
                    xhr.setRequestHeader( 'X-WP-Nonce', restapi_details.nonce );
                },
                success : function( response ) {
                    // Save the page ID in case you need it for something
                    var myNewPageID = response.id;
                }
            });
        });
    }
})(jQuery);