Get Gelbooru Post

Gelbooru is the odd one out in this pack, and the node knows it. It's the biggest of the "other" boorus, and its API behaves differently from every other board here: tags aren't categorized (you get one big string), it only serves preview and original image sizes, and - since the UK spam incidents got it hammered with ten thousand requests a second - it now requires an API key and user ID on every request. So Get Gelbooru Post is the pack's fiddliest fetch node, and the first thing you need to know is the key part.

The API key is the setup

There's no key input field. The node extracts api_key and user_id from the URL you give it, so you paste them into the post link yourself. Both are on Gelbooru's account options page, at the bottom. The URL you feed the node ends up looking like:

https://gelbooru.com/index.php?page=post&s=view&id=12345&api_key=YOURKEY&user_id=YOURID

Without the key, Gelbooru refuses or rate-limits you to near-uselessness. With it, the node rebuilds the request as the proper API call and everything flows. The one free pass: safebooru.org (a Gelbooru fork, unrelated to safebooru.donmai.us) is also supported and doesn't need credentials.

How it works

The handler fetches the post via Gelbooru's page=dapi&s=post&q=index endpoint, parses whichever JSON shape comes back (the response format has drifted between versions, and the parser handles both the list form and the wrapped post form), and reads the single flat tags field. Because there are no categories, you get one ALL_TAGS output instead of the split set - which means this node only makes sense with tag-prompting models that tolerate a flat list. For image sizes, original grabs the full file and everything else remaps to preview, since those are the only two Gelbooru keeps.

The rest of the inputs are the pack standard: url, img_size, format_tags, trailing_comma, exclude_tags, and user_excluded_tags. Outputs are just IMAGE, ALL_TAGS, ORIGINAL_WIDTH, and ORIGINAL_HEIGHT - a deliberately small set.

Install

Same as the rest of the pack:

cd ComfyUI/custom_nodes
git clone https://github.com/DraconicDragon/ComfyUI_e621_booru_toolkit

restart, done. Dependencies are the usual requests, pillow, curl_cffi.

Use the dedicated node, not the Any node

One trap worth flagging: this is marked experimental, and if you're tempted to use Get Booru Post (Any Service) with a Gelbooru URL instead, don't - the Any node's flat output doesn't surface Gelbooru's ALL_TAGS, so you'd get an empty tag string. Gelbooru is the one board where the specific node isn't just nicer, it's required. Set up the key once, and it's the reliable path into a board whose tags are otherwise a wall of comma-separated noise.