WordPress at a glance
action is not described

rest_api_init action-hook . WP 4.4.0

Fires when preparing to serve an API request.

Endpoint objects should be created and register their hooks on this action rather than another action to ensure they're only loaded when needed.

Usage

add_action( 'rest_api_init', 'action_function_name_6421' );
function action_function_name_6421( $wp_rest_server ){
	// action...
}
$wp_rest_server(WP_REST_Server)
Server object.

Changelog

Since 4.4.0 Introduced.

Where the hook is called

rest_get_server()
rest_api_init
wp-includes/rest-api.php 506
do_action( 'rest_api_init', $wp_rest_server );

Where in WP core the hook is used WordPress

wp-includes/rest-api.php 455
add_action( 'rest_api_init', 'rest_api_default_filters', 10, 1 );
wp-includes/rest-api.php 456
add_action( 'rest_api_init', 'register_initial_settings', 10 );
wp-includes/rest-api.php 457
add_action( 'rest_api_init', 'create_initial_rest_routes', 99 );
wp-includes/rest-api.php 563
add_action( 'rest_api_init', 'wp_oembed_register_route' );