WP - Get remote json file and cache

WP-json-cache.php

<?php

// using http://codex.wordpress.org/Function_Reference/wp_remote_get and http://codex.wordpress.org/Transients_API

// if transient has expired then recreate, if not grab from db
if ( false === ( $featured_trans = get_transient( 'featured_trans' ) ) ) {
     
	$featured_args = array(
		'timeout'     => 5,
		'redirection' => 5,
		'sslverify'   => false
	);

	$featured_feed = wp_remote_get( 'http://www.example.com/somefeed/', $featured_args );
	$featured_json = $featured_feed['body'];
	$featured_array = json_decode( $featured_json, true );

	$featured_trans = $featured_array;
	set_transient( 'featured_trans', $featured_trans, 12 * HOUR_IN_SECONDS ); // expiration is set for 12 hours
	
}

// do something with $featured_trans

?>