wp rest api get posts with their meta

if you want single field use:

register_rest_field( 'post', 'views', array(
'get_callback' => function ( $data ) {
    return get_post_meta( $data['id'], 'hs_views', true );
}, ));

don't forget change hs_views field to what you want

if you want all fields use:

register_rest_field( 'post', 'meta', array(
'get_callback' => function ( $data ) {
    return get_post_meta( $data['id'], '', '' );
}, ));

check reference: get_post_meta

I found an easy solution for this. In the current theme - functions.php add the following code:

register_rest_field( 'post', 'metadata', array(
    'get_callback' => function ( $data ) {
        return get_post_meta( $data['id'], '', '' );
    }, ));

It will return posts / post with all it's meta. I.e. http://localhost/rest_api/wp-json/wp/v2/posts or http://localhost/rest_api/wp-json/wp/v2/post/58

post meta will be in "metadata"