Surface all Gutenberg blocks in the WordPress REST API

wp-rest-api-add-gutenberg-blocks.php

<?php

add_action('rest_api_init', function() {

	// Surface all Gutenberg blocks in the WordPress REST API
	$post_types = get_post_types_by_support( [ 'editor' ] );

	foreach ( $post_types as $post_type ) {
		if ( gutenberg_can_edit_post_type( $post_type ) ) {

			register_rest_field( $post_type, 'blocks', [
				'get_callback' => function ( array $post ) {
					return gutenberg_parse_blocks( $post['content']['raw'] );
				}
			] );

		}
	}

});