Automatically expose all the ACF fields to the Wordpress REST API in Pages and in your custom post types.

expose_ACF_fields_to_REST.php

<?php
    function create_ACF_meta_in_REST() {
        $postypes_to_exclude = ['acf-field-group','acf-field'];
        $extra_postypes_to_include = ["page"];
        $post_types = array_diff(get_post_types(["_builtin" => false], 'names'),$postypes_to_exclude);

        array_push($post_types, $extra_postypes_to_include);

        foreach ($post_types as $post_type) {
            register_rest_field( $post_type, 'ACF', [
                'get_callback'    => 'expose_ACF_fields',
                'schema'          => null,
           ]
         );
        }

    }

    function expose_ACF_fields( $object ) {
        $ID = $object['id'];
        return get_fields($ID);
    }

    add_action( 'rest_api_init', 'create_ACF_meta_in_REST' );