Patterns Debug

Adds two debugging surfaces to the WordPress block editor (post editor and site editor):

Pattern browser

A pinnable Patterns Debug sidebar with a Selected block debug panel on top, followed by a browser listing every pattern the editor knows about:

• Registered patterns from the client stores (core, theme, plugin, pattern directory), plus user patterns (wp_block posts) with their sync status.
• Search plus source and category filters.
• Per pattern: metadata (source, categories, block types, sync status, inserter visibility), a recursive block-usage count, copy name/content, a JSON dump, and a live BlockPreview.
• A Server registry section backed by a REST endpoint (wp-patterns-debug/v1/registry) that dumps the raw server-side WP_Block_Patterns_Registry and category registry — including patterns hidden from the inserter — exactly as PHP registered them.

Block debug panel

A Debug panel in the block inspector for the selected block, and the same panel as Selected block in the plugin sidebar. The sidebar copy matters: the block inspector renders no panels at all for synced pattern instances (core/block), so the sidebar is the only place they can be debugged.

• Overview (name, client ID) with copy actions.
• Dumps: block instance, block type, the wrapper element's rendered DOM attributes, serialized block HTML.
• Attributes editor: the block's attributes as raw, validated JSON. Apply/reset; deleting a key removes the attribute; keys outside the block type's attribute schema are flagged but allowed.
• Pattern provenance: shows when the selected block is a synced pattern instance (core/block ref, wp_block record, per-instance overrides) or was inserted from a pattern (metadata.patternName), with dumps of the source pattern.

Screenshots

Debug panel in the block inspector — overview, dumps, serialized HTML, and the raw JSON attributes editor:

Dump modals — pretty-printed, copyable dumps of the block instance, block type, or wrapper element:

Pattern browser — search and filter every registered and user pattern, with metadata, block counts, and live previews:

Synced pattern provenance — the sidebar's Selected block panel debugging a core/block instance (the block inspector renders no panels for these):

Server registry — the raw server-side pattern registry, dumped over REST, including patterns hidden from the inserter:

Installation

Via Composer:

composer require danlapteacru/wp-patterns-debug

Or clone/download into wp-content/plugins/wp-patterns-debug — built assets are committed, so no build step is needed.

Requirements

• WordPress 6.6+ (unified @wordpress/editor plugin APIs, react-jsx-runtime).
• PHP 8.1+.

Access control

All debug surfaces (assets and the REST endpoint) require the view_patterns_debug capability, mapped to edit_posts by default. Remap it by filtering map_meta_cap at a priority above 0:

add_filter( 'map_meta_cap', function ( $caps, $cap ) {
    if ( 'view_patterns_debug' === $cap ) {
        $caps = [ 'manage_options' ];
    }

    return $caps;
}, 10, 2 );

Development

npm install
npm run build      # production build into build/
npm run start      # watch mode
npm run test       # jest unit tests
npm run typecheck  # tsc --noEmit
npm run lint:js    # eslint (WordPress config)

The plugin loads vendor/autoload.php when present but does not require Composer; a minimal PSR-4 autoloader covers src/.

License

GPL-2.0-or-later