CORS error happen when activate JSON API Plugin, that is required

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function add_cors_http_header(){
    header("Access-Control-Allow-Origin: *");
}
add_action('init','add_cors_http_header');

Add this code to your theme functions.php

In the file located in wp-content/plugins/json-api/singletons/api.php, add following line:

    <? header("Access-Control-Allow-Origin: *"); ?>