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

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How can I add a custom REST API endpoint in WordPress? Pending Review

Asked on Apr 11, 2026

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Previous Question

To add a custom REST API endpoint in WordPress, you need to use the `register_rest_route` function within a custom plugin or your theme's `functions.php` file. This function allows you to define a new route and specify the callback function that handles requests to that route.

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

Additional Comment:

Ensure you have a clear namespace (e.g., "myplugin/v1") to avoid conflicts with other plugins or themes.
Use appropriate HTTP methods (GET, POST, etc.) based on the action your endpoint performs.
Test your endpoint by visiting "https://yourwebsite.com/wp-json/myplugin/v1/custom-endpoint" in your browser or using a tool like Postman.

✅ Answered with WordPress best practices.

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How can I add a custom REST API endpoint in WordPress? Pending Review

Asked on Apr 11, 2026

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