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Does anybody know if I can do an OR search in the URL like:

http://www.example.com/api/wp-json/wp/v2/books/?(filter[category_name]=anthropology&filter[category_name]=africa)|(filter[category_name]=anthropology&filter[category_name]=china)

(this example actually returns data but only the results for the second filter group (anthropology / china))

Any hints appreciated!

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  • The category_name parameter takes a single string, and doesn't support an array as an argument, even if you get an array out of this WP_Query won't support that, you'll need to pass in IDs instead and use category__in
    – Tom J Nowell ♦
    Oct 28, 2016 at 18:27

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First (since 4.7.1) you will need to re-activate the filter parameter. Then make sure you have REST support activated for your custom post type (books).

Next you have to allowing the query args meta_query and parse it.

This answer shows how to do all this. Specifically, how to construct the meta query and the compare operators. : https://wordpress.stackexchange.com/a/227869/111022

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