I'm trying to unregister core block types in WordPress Gutenberg.

I've used the code provided here: https://github.com/WordPress/gutenberg/blob/master/docs/extensibility/extending-blocks.md#removing-blocks

But I can't get it to work. I feel like there may be a simple step I am missing?

  1. I created a plugin which I activated in my WP theme.
  2. In my plugin [clore-blocks] folder I created "clore-blocks.php". It contains:
 * Remove certain blocks.
function clore_blacklist_blocks() {
        plugins_url( 'blocks.js', __FILE__ ),
        array( 'wp-blocks' ),
        filemtime( plugin_dir_path( __FILE__ ) . 'blocks.js' ) // Version: filemtime - Gets file modification time.
add_action( 'enqueue_block_editor_assets', 'clore_blacklist_blocks' );
  1. In blocks.js I have only:
wp.blocks.unregisterBlockType( 'core/verse' );

I thought this would remove the "Verse" block type from being used, but when I go to edit a page with the Gutenberg editor, "Verse" is still there.

When I view the page source from the WP edit page, I can see that my "blocks.js" file is being referenced correctly, but It's just not doing anything... or at least not what I want it to do. Do you have any idea why that is?

  • 1
    What do you mean by "a plugin which I activated in my WP theme?" Is your code a plugin, or a theme? – WebElaine Aug 3 at 19:49
  • My code is written as it's own little plugin. – LKD Aug 6 at 14:05

Everything works for me with allowed_block_types hook.


add_filter( 'allowed_block_types', 'my_function' );

function my_function( $allowed_block_types ) {

    return array(


You can insert the above code to your functions.php file to a custom plugin. It removes all blocks except the Paragraph block.

More examples here https://rudrastyh.com/gutenberg/remove-default-blocks.html

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