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How can I add custom fields to a WordPress REST API response?

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How can I add custom fields to a WordPress REST API response?

Asked on Jan 20, 2026

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To add custom fields to a WordPress REST API response, you can use the `register_rest_field` function. This allows you to include additional data in the API response for a specific post type.

<!-- BEGIN COPY / PASTE -->
    function add_custom_fields_to_rest_api() {
        register_rest_field('post', 'custom_field', array(
            'get_callback' => function($object) {
                return get_post_meta($object['id'], 'custom_field_key', true);
            },
            'schema' => array(
                'description' => 'Custom field added to REST API response',
                'type' => 'string',
            ),
        ));
    }
    add_action('rest_api_init', 'add_custom_fields_to_rest_api');
    <!-- END COPY / PASTE -->

Additional Comment:

Replace "post" with your desired post type if necessary.
"custom_field_key" should be replaced with the actual meta key of your custom field.
This code should be placed in your theme's functions.php file or a custom plugin.
Ensure that the REST API is enabled for the post type you are modifying.

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How can I add custom fields to a WordPress REST API response?

Asked on Jan 20, 2026

Answer

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