Works fine for me, under meta section. If no custom fields are there, meta will be empty.
Actually I think the problem is that I am using the ACF Plugin (http://wordpress.org/plugins/advanced-custom-fields/) and, I assume, those values are not stored as regular custom fields.
They are stored alongside the usual custom fields, inside wp_postmeta table. Only ACF adds an extra key-value pair to its fields:
meta_id post_id meta_key meta_value
1607 XX testimonial YY
1608 XX _testimonial field_5177d30141f17
Interesting. Well that is good to know, but even still my ACF values are not in the JSON object returned. I’ll keep investigating.
This may be related to issue #10, can you confirm it’s fixed in 0.7?
Confirmed! The issue is resolved. Thanks for the update.