Add posts to term JSON data

functions.php

<?php

function my_json_prepare_term( $data, $term, $context ) {

	global $wp_query;
	$route = $wp_query->query['json_route'];
	if ( ! preg_match( '/(terms\/.+)/', $route) )
		return $data;

	$args = array(
		'tax_query' => array(
			array(
				'taxonomy' => $term->taxonomy,
				'field' => 'slug',
				'terms' => $term->slug
			)
		),
		'posts_per_page' => 5
	);
	$posts = get_posts( $args );

	$posts_arr = array();
	foreach ( $posts as $p ) {
		$posts_arr[] = array(
			'ID' => $p->ID,
			'title' => $p->post_title
			);
	}

	$data['posts'] = $posts_arr;

	return $data;
}
add_filter( 'json_prepare_term', 'my_json_prepare_term', 10, 3 );