Dima Polos

global $post;
foreach( $your_array as $post ):
  setup_postdata( $post );
?>
<article>
  <h2> <?php the_title(); ?> </h2>
  <div> <?php the_content(); ?>
</article>
<?php
endforeach;
wp_reset_postdata();

var data = JSON.stringify({ search: value });
var xhr = new XMLHttpRequest();
xhr.open( 'POST', url );
xhr.setRequestHeader('Content-Type', 'application/json; charset=utf-8');
xhr.send( data );
xhr.addEventListener( 'readystatechange', function(){
  if( xhr.readyState !== 4 ) return;
  if( xhr.status === 200 ){
    console.log( xhr.responsetext ); // ответ в консоль
  } else {
    console.log( xhr.statusText );
  }
});

async () => {
const req = await fetch( url, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json; charset=utf-8'
  },
  body: JSON.stringify({ search: value })
});
if(  req.ok){
  const res = await req.json(); // .text(), .blob()...
  console.log( res ); // ответ в консоль
}
}