I would like to add a button that triggers some custom JS code to the top roolbar (not the block level editor toolbar):

Shows location of where the button should be added

Is there an official way to do this? I couldn't find any documentation about extending the top toolbar.

Thanks Aaron

1 Answer 1


This is presently not offered as an extension point. The source for the post editor's toolbar shows that these items are hard-coded, and do not offer any filters or Slotfills.

Issue #16174 provides a feature request for such extension points.

  • 1
    Thanks @bosco. I've actually went with inserting it using JS at the end.
    – Aaron
    Jun 23, 2021 at 6:41

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