In gutenberg/block-editor, how can I check whether I've already registered a block type? Is there a function I can use? Searching through the Block Editor Handbook I couldn't see a function to check this.

An example of what I am trying to do is below:

class My_Block {

    public function __construct() {
        if ( ! SOME_FUNCTION_block_exists('foo/column') ) {
            register_block_type( 'foo/column', my_args );
  • 1
    have you encountered problems with blocks being registered multiple times? What's the reason and context behind the question?
    – Tom J Nowell
    Mar 3, 2022 at 1:40
  • @TomJNowell I haven't tested what happens when a block is registered twice. The reason is for efficiency of code.
    – sazr
    Mar 3, 2022 at 8:58

2 Answers 2



I just realized you're doing this on the PHP side. There is a class called WP_Block_Type_Registry that you can use to see what is already registered:

$registry = WP_Block_Type_Registry::get_instance();
if ( ! $registry->get_registered( 'foo/column' ) ) {
    // YOUR CODE

Gutenberg should fire a console error if a block has already been registered. See the registerBlockType src here.


When editing a page using Gutenberg, you can use the Developers Console to execute wp.blocks.getBlockTypes() and get all active registered blocks in Gutenberg.

You can also use the WP_Block_Type_Registry Class in order get all server-side registered Blocks. You can than either use get_all_registered() or get_instance():




Both do the same. get_instance() returns itself.

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