What is the WordPress `register_meta()` function and how does it enable REST API exposure of post meta?

Question

WordPress Expert — Medium

What is the WordPress `register_meta()` function and how does it enable REST API exposure of post meta?

Accepted Answer

The WordPress `register_meta()` function, when used with 'show_in_rest' => true, automatically exposes a meta key in the REST API response, allowing it to be used in the block editor. This function registers the meta key's type, sanitize callback, and auth callback.