rest-api-auth-hook

// Check for the existence of a header authentication token before dispatching any data
add_filter( 'rest_pre_dispatch', function() {
    $requestPath = $_SERVER['REQUEST_URI'];
    if($requestPath != '/wp-json/jwt-auth/v1/token') {
        $tokenValidationResponse = apply_filters('validate_token', null);
        if(gettype($tokenValidationResponse) == 'object' && get_class($tokenValidationResponse) == "WP_Error") {
            foreach($tokenValidationResponse->error_data as $key => $error) {
                $status = $error['status'];
                $msg = $key;
            };

            return array(
                'error' => array(
                    'msg' => $msg,
                    'code' => $status,
                ));
        }
    }
});