I'm trying to output all of the fields in the json result but seem to be using the object incorrectly. I want to add author meta fields to the post endpoint.

This doesn't work

    function slug_show_author_meta( $object, $field_name, $request ) {
      return  get_the_author_meta( $object[ 'id' ], $field_name );

This does but only gives me one field

    function slug_show_author_meta( ) {
      return  get_the_author_meta('user_nicename');

Ideally I'd just like to get user_nicenaem, user_email, display_name, nicename, first_name and last_name. Thanks!

3 Answers 3


This should work:

function wpse_20160421_get_author_meta($object, $field_name, $request) {

    $user_data = get_userdata($object['author']); // get user data from author ID.

    $array_data = (array)($user_data->data); // object to array conversion.

    $array_data['first_name'] = get_user_meta($object['author'], 'first_name', true);
    $array_data['last_name']  = get_user_meta($object['author'], 'last_name', true);

    // prevent user enumeration.

    return array_filter($array_data);


function wpse_20160421_register_author_meta_rest_field() {

    register_rest_field('post', 'author_meta', array(
        'get_callback'    => 'wpse_20160421_get_author_meta',
        'update_callback' => null,
        'schema'          => null,

add_action('rest_api_init', 'wpse_20160421_register_author_meta_rest_field');
  • tried it and gave me back post_author_meta": [0] I named the field and added it to the post. register_rest_field('post', 'post_author_meta', array( 'get_callback' => 'slug_show_author_meta', 'update_callback' => null, 'schema' => null, ) ); before I saw your code i did try get_user_data and I can get get back nicename, displayname etc but not last or first. I changed your code to include $post_author = (int) $object['author']; $user_data = get_userdata($post_author); but still returns the wrong fields
    – Mr Brimm
    Commented Apr 21, 2016 at 2:46
  • Whoops! I didn't notice you want to get post author meta :). Just updated the answer.
    – Minh Tri
    Commented Apr 21, 2016 at 2:56
  • Ha. You def pointed me in the right direction and I got it. Thanks! I tried yours and that works as well. See what I did that was similar.
    – Mr Brimm
    Commented Apr 21, 2016 at 3:22
  • Cheer! Welcome to WPSE :)
    – Minh Tri
    Commented Apr 21, 2016 at 3:29

This worked for me:

add_action( 'rest_api_init', 'user_puntuacio' );

function user_puntuacio() {
    register_rest_field( 'user', 'puntuacio',
            'get_callback'    => 'get_user_puntuacio',
            'update_callback' => null,
            'schema'          => null,

function get_user_puntuacio( $object, $field_name, $request ) {
    return get_user_meta( $object[ 'id' ], 'puntuacio', true );

Note that 'puntuacio' is the custom user meta I wanted to add.


This did the trick thanks to @Dan for pointing me in the right direction.

    function slug_show_author_meta( $object ) {
       $post_author = (int) $object['author'];
        $array_data = array();

        $array_data['login'] = get_the_author_meta('login');

        $array_data['email'] = get_the_author_meta('email');

        $array_data['user_nicename'] = get_the_author_meta('user_nicename');

        $array_data['first_name'] = get_user_meta($post_author, 'first_name', true);

        $array_data['last_name'] = get_user_meta($post_author, 'last_name', true);

        $array_data['nickname'] = get_user_meta($post_author, 'nickname', true);

        return array_filter($array_data);

it returns

     "post_author_meta": {
     "login": "billy"
     "email": "[email protected]"
     "user_nicename": "billy"
     "first_name": "Billy"
     "last_name": "Boy"
     "nickname": "billy"
  • If answer works for you then please accept the answer by Dan instead of posting a thank you post!
    – Sumit
    Commented Apr 21, 2016 at 7:07
  • 1
    I got you but not really a thank you post. I posted the code I wrote that got me what I wanted that Dan had sparked. Apparently we were working it at the same time and came up with slightly different methods.
    – Mr Brimm
    Commented Apr 22, 2016 at 1:07

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