I am trying to create a REST APIs for my wordpress website which is used for facility listing using wordpress job manager plugin.

I have registered my custom post , taxonomies in \plugins\rest-api\plugin.php.

below API gives me all the listings with default response.


I wanted to add post meta in the JSON response using the below code.

function slug_register_phone_number() {
            register_rest_field( 'job_listing',
                'get_callback' => 'slug_get_phone_number',
                'update_callback' => null,
                'schema' => null,

    function slug_get_phone_number($post, $field_name, $request) {
        return get_post_meta($post->id, '_phone' );

Using above code i am able to add "phone" as a REST response but i am always getting phone = false in response. It is not showing the correct data from wp_postmeta table.

I have followed below mentioned links for reference.


Plug in details. 1. WP Job manager 2. rest-api

Any help will be really helpful.

  • where do you see the "false"? Have you checked what is actually going on the "wire" with the browser's network tools? – Mark Kaplun May 23 '16 at 3:32
  • Hi i am getting in JSON as a response. – Hari Soni May 23 '16 at 3:33
  • I am using chrome plugin postman to hit the service. I am not using any kind of authentication. Its a simple API request without any data in request body. – Hari Soni May 23 '16 at 3:52
  • then how do you know that you actually trigger the right post? do you even get to that callback?. – Mark Kaplun May 23 '16 at 3:56
  • I am new to PHP and wordpress. I am working with JAVA for long time. Could you please let me know how i can check if my function is called or not? I tried to print the post object but not able to see the value.. – Hari Soni May 23 '16 at 4:38

$post in the callback function is an array, not an object. So you cannot use $post->id. Change it to $post['id'] and it should work:

function slug_get_phone_number($post, $field_name, $request)
    return get_post_meta($post['id'], '_phone', true);

I recommend to change _phone to phone_number or something else without underscore prefix. Because _ is often used with private meta keys. Try to add a custom field which has meta key with _ prefix directly to your post, you will see what I meant.


WP API has a rest_prepare_post filter (or rest_prepare_CPT if you are working with custom posts) which you can use to modify the JSON response. In your case it will be rest_prepare_joblisting.

function filter_joblisting_json( $data, $post, $context ) {
$phone = get_post_meta( $post->ID, '_phone', true );

if( $phone ) {
    $data->data['phone'] = $phone;

return $data;
add_filter( 'rest_prepare_joblisting', 'filter_joblisting_json', 10, 3 );

Using the same filter you can also remove fields/data from the response and do any manipulation of the data. Here you can find some examples of using the filter that may be useful and get to know how it works.

  • +1 as it is probably a better way than trying to get each info in different requests as the OP seems to do. – Mark Kaplun May 23 '16 at 16:50
  • This solution worked perfectly for me – Asif Sep 23 '17 at 18:40

Just Add this methods to function.php

add_action( 'rest_api_init', 'create_api_posts_meta_field' );

function create_api_posts_meta_field() {

 // register_rest_field ( 'name-of-post-type', 'name-of-field-to-return', array-of-callbacks-and-schema() )
 register_rest_field( 'tour', 'metaval', array(
 'get_callback' => 'get_post_meta_for_api',
 'schema' => null,

function get_post_meta_for_api( $object ) {
 //get the id of the post object array
 $post_id = $object['id'];

 //return the post meta
 return get_post_meta( $post_id );

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