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The default content at /wp-json/ contains name, description, url etc. but I want to add some additional content at this root level.

I see lots of ways to modify the responses of items with object types but am missing how to modify the main index.

It appears I want to modify the $available array of the get_index function of /wp-includes/rest-api/class-wp-rest-server.php/ but I'm just not sure how to filter/hook that.

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function filterResponse($response){
  $data = $response->data;
  $data['extra_field'] = 'some data';
  $response->set_data($data);
  return $response;
 }

add_filter('rest_index', 'filterResponse');

Thanks to Jeff

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