Assusming you are using V1 of the WP-API, did you tried the following endpoint:
http://www.example.com/wp-json/posts?filter[category_name]=pink+warm
I’m looking at the code in WP_JSON_Posts class and the get_post() should be able to handle that use case.
UPDATE: It seems there is a limitation with the way the query is built.
Here is a potential workaround:
add_filter('json_query_var-category_name', function( $var ) {
return str_replace(' ', '+', $filter[ $var ] );
});
Or even better (without new code)! Encode the + in the url with %2B:
http://www.example.com/wp-json/posts?filter[category_name]=pink%2Bwarm
This seems to work for me!
See here for clarifications: https://bugs.php.net/bug.php?id=39078
Note: In V2 this endpoint will not work.
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