[wp-hackers] JSON API 1.0 release

[Otto]

On Tue, Jun 29, 2010 at 2:26 PM, Otto <otto at ottodestruct.com> wrote:
> BTW, it wouldn't be difficult at all to implement a JSON system using
> the built in feeds mechanism. The add_feed function is pretty darned
> powerful when you get right down to it.

Here's a quick and dirty example:

<?php
/*
Plugin Name: JSON Feed Demo
*/
add_action('init','custom_add_json_feed');
function custom_add_json_feed() {
	add_feed('json','custom_json_output');
}
function custom_json_output($for_comments) {
	global $post;
	header('Content-Type: application/json', true);
	$out_posts = array();
	while (have_posts()) : the_post();
		$out_posts[]=$post;
	endwhile;
	echo json_encode($out_posts);
}



After enabling the plugin, you'll need to update the permalinks (since
I didn't add a flush on activation). After that, /feed/json/ on
anything will produce a json output of the posts in question.

I didn't implement the $for_comments variable, which gets set when
you're asking for a comments feed. You can also implement a callback
by adding your own query variable, if you like. I'll leave those as an
exercise for the reader.

-Otto