How should a user retrieve all posts that have a meta key

[CGeorges]

I want to retrieve all posts that have a certain meta key.

Eg: filter[meta_key] = test
filter[meta_value] = on

Passing this filter to /wp-json/posts returns all posts. What should I do in order to achieve this result ?

[Toddses]

These fields aren't filterable by default. They can be added via the rest_query_vars filter:

add_filter( 'rest_query_vars', 'flux_allow_meta_query' );
function flux_allow_meta_query( $valid_vars )
{
    $valid_vars = array_merge( $valid_vars, array( 'meta_key', 'meta_value', 'meta_compare' ) );
    return $valid_vars;
}

That should open up the filter for the wp-json/wp/v2/posts endpoint, like so wp-json/wp/v2/posts?filter[meta_key]=test&filter[meta_value]=on

[CGeorges]

Thank you! Is for v1 the same process ? I forgot to mention I was using v1 sorry!

[equatorapps]

This works for a single meta key, but how do we use this filter to limit the results based on multiple meta keys?

[danielbachhuber]

how do we use this filter to limit the results based on multiple meta keys?

You'll need to write some custom code for this, as it isn't supported out of the box.

[trevanhetzel]

@danielbachhuber Would you happen to have any resources to link to about writing a custom filter (if possible)? Like @equatorapps, I'd also like to limit results based on multiple meta keys.

With v1 I was doing it like this and it seemed to work fine:

&filter[meta_value][month]=12&[meta_value][year]=2015

Thanks!

[msankar1991]

How to write some custom code for two or more custom meta fields filter using with REST WP API.Can you give me the example..

example: filter[meta_key]=beds&filter[meta_value]=4&filter[meta_compare]=>=&filter[meta_key]=basins&filter[meta_value]=4&filter[meta_compare]=>=

And also how to filtering custom post type on a combination of custom taxonomies and custom meta fields?

[benlk]

Leaving a note here for future spelunkers:

The rest_query_vars filter no longer exists in WordPress. Take a look at https://developer.wordpress.org/reference/hooks/rest_this-post_type_collection_params/ and https://developer.wordpress.org/reference/hooks/rest_this-post_type_query/