| get_rest_url() | Retrieves the URL to a REST endpoint on a site. |
| register_rest_field() | Registers a new field on an existing WordPress object type. |
| register_rest_route() | Registers a REST API route. |
| rest_ensure_response() | Ensures a REST response is a response object (for consistency). |
| rest_is_boolean() | Determines if a given value is a boolean or boolean-like. Doesn't look at the type of a given value, and like in PHP, |
| rest_output_link_wp_head() | Displays a link to the root REST API route in the <head> section on all site pages. |