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How can I create a custom REST API endpoint in WordPress?

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How can I create a custom REST API endpoint in WordPress?

Asked on Feb 01, 2026

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

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

    function my_custom_endpoint_callback(WP_REST_Request $request) {
        return new WP_REST_Response(array('message' => 'Hello, World!'), 200);
    }
    <!-- END COPY / PASTE -->

Additional Comment:

Place the code in your theme's `functions.php` file or a custom plugin.
Replace `'myplugin/v1'` and `/data/` with your desired namespace and endpoint path.
The callback function should handle the request and return a `WP_REST_Response` object.
Test the endpoint by visiting `https://yourwebsite.com/wp-json/myplugin/v1/data/`.

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How can I create a custom REST API endpoint in WordPress?

Asked on Feb 01, 2026

Answer

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