Manipulate Meta with the WP API

This is a WordPress plugin. It adds routes to the REST API to read, write, and delete post and term meta values separately from posts and terms.

Why though?

As of this writing, it is not possible to delete a meta value using the WordPress REST API. Post meta updates must be communicated while inserting and updating whole post objects, and the only way to remove meta fields from a post is to write blank values. This plugin allows one request to retrieve, update, or delete a meta field independently from a post object. It also allows one request to bulk delete meta fields by accepting an array of meta keys as a parameter.

How?

Read, Write, or Delete a Single Meta Value

Use GET, POST, or DELETE verbs with an endpoint like this:

https://example.test/wp-json/wp/v2/{post_type}/{post_id}/meta/{meta_key}

...or like this for term meta:

https://example.test/wp-json/wp/v2/{taxonomy}/{term_id}/meta/{meta_key}

When writing a value with POST, use a JSON body to specify the value:

{
    "value": "New meta value!"
}

Bulk Delete Meta Values

Use the DELETE verb with an endpoint like this:

https://example.test/wp-json/wp/v2/{post_type}/{post_id}/meta

...or like this for term meta:

https://example.test/wp-json/wp/v2/{taxonomy}/{term_id}/meta

...and a JSON body to specify which meta values should be deleted:

{
    "keys":
    [
        "meta_key_to_delete_1",
        "meta_key_to_delete_2"
    ]
}