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How can I create a custom WordPress REST API endpoint?

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How can I create a custom WordPress REST API endpoint?

Asked on Feb 12, 2026

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Creating a custom WordPress REST API endpoint involves using the `register_rest_route` function to define a new route and its callback function. This allows you to extend the REST API with custom functionality.

<!-- BEGIN COPY / PASTE -->
    add_action('rest_api_init', function() {
        register_rest_route('myplugin/v1', '/custom-endpoint', array(
            'methods' => 'GET',
            'callback' => 'my_custom_endpoint_callback',
        ));
    });

    function my_custom_endpoint_callback($data) {
        return new WP_REST_Response('Hello, this is a custom endpoint!', 200);
    }
    <!-- END COPY / PASTE -->

Additional Comment:

Place the code in your theme's `functions.php` file or in a custom plugin.
The `register_rest_route` function takes three parameters: namespace, route, and an array of options including methods and callback.
The callback function should return a `WP_REST_Response` object or an array.
Ensure your endpoint is unique by using a custom namespace like 'myplugin/v1'.

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How can I create a custom WordPress REST API endpoint?

Asked on Feb 12, 2026

Answer

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