I'm working on a project using WP-API and Angular.
I just added a new custom image size to the functions.php
My /wp-json/posts (the JSON output) shows the url for the new image size and using the url works.
http://localhost/mysite/wp-content/uploads/2015/07/6823214-large-600x300.jpg
But outputting the URL with Angular doesn't work (returns "0")
{{house.featured_image.attachment_meta.sizes.blog-thumb.url}}
However this still works fine (the original sizes):
{{house.featured_image.attachment_meta.sizes.medium.url}}
{{house.featured_image.attachment_meta.sizes.thumbnail.url}}