Are Meta Box fields supported by the official WordPress REST API? I see they have a plugin to support ACF, which suggests something extra is needed for custom fields, but I haven't found anything regarding Meta Box. The default JSON response does not appear to include any custom meta fields - only the WP post/page basics.
In the meantime, in case anyone else needs this before the official solution is available, I did discover that there is some built-in options already for custom fields. http://v2.wp-api.org/extending/modifying/
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