Function and usage of rest_convert_error_to_response() in wordpress


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    The rest_convert_error_to_response() function in WordPress is designed to convert errors into a format that can be more easily handled by REST API responses. Here's a detailed explanation of this function:

    Function Signature

    rest_convert_error_to_response( WP_Error $error ): WP_REST_Response


    • Function: rest_convert_error_to_response()
    • Role: Converts an instance of WP_Error into a WP_REST_Response object.


    • The function takes a WordPress error object (WP_Error) and processes it to create a REST API response.
    • It iterates over all the error codes and messages within the WP_Error object.
    • The function converts these errors into a flat array structure. This is crucial because it simplifies the client's handling of these errors.
    • In the resulting JSON representation, errors are shown as a list (an array of associative arrays) rather than as an object or a map. This format is more straightforward for clients to interpret and process.


    • $error (WP_Error) (Required): The instance of WP_Error that needs to be converted. This object contains the error codes and messages that the function will process.

    Return Value

    • Return Type: WP_REST_Response
    • Content: The function returns a WP_REST_Response object. This object contains a list of associative arrays. Each array represents an individual error and has two keys:
      • code: The error code.
      • message: The corresponding error message.

    Sample Usage

    Here's an example of how you might use rest_convert_error_to_response():

    function handle_my_custom_error() {
        $error = new WP_Error();
        // Add errors to the WP_Error object
        $error->add('my_custom_error_code', 'This is a custom error message.');
        // Convert the WP_Error object to a WP_REST_Response object
        $response = rest_convert_error_to_response($error);
        // Now $response can be returned in a REST API request
        return $response;

    In this example, a custom error is created and added to a WP_Error object. The rest_convert_error_to_response() function is then used to convert this error into a REST response, which can be returned in the context of a REST API request. This makes error handling consistent and straightforward for API clients.

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