Remove Content From WP API Response When Listing Posts

functions.php

<?php
function my_rest_prepare_post( $data, $post, $request ) {
	$_data = $data->data;

	$params = $request->get_params();
	if ( ! isset( $params['id'] ) ) {
		unset( $_data['content'] );
	}

	$data->data = $_data;

	return $data;
}
add_filter( 'rest_prepare_post', 'my_rest_prepare_post', 10, 3 );