ComfyUI MoonPack

A focused collection of utility nodes for ComfyUI. Strings, dimensions, dynamic inputs, fast bypassers, and a couple of video helpers.

Installation

Via ComfyUI Manager

Search for MoonPack and install.

Manual

cd ComfyUI/custom_nodes
git clone https://github.com/moonwhaler/comfyui-moonpack.git

Then restart ComfyUI.

Compatibility

v0.2 renamed all node registry keys to use a MoonPack_ prefix. Workflows saved with v0.1 still load — legacy keys are kept as aliases (marked "(legacy)" in the menu) for one release cycle. Save your workflow once after loading and it will automatically migrate to the new keys.

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Nodes

All nodes are under the MoonPack/ category in the Add Node menu.

MoonPack/image

Node	Purpose
Proportional Dimension	Resize W/H to a target side while preserving aspect; snap to a divisor with nearest/floor/ceil rounding; optional from_image input. Outputs width, height, shortest_side, longest_side, scale.
Dimension From Image	Reads width, height, batch_size from an IMAGE tensor.
Smart Resolution	Picks a model-friendly resolution near a megapixel budget while preserving aspect ratio. Presets for SD 1.5, SDXL, Flux (1.0/1.4 MP), and Wan 480p/720p.

MoonPack/string

Node	Purpose
Simple String Replace	Sequential find => replace pairs (one per line). Optional whole-word match. Reports malformed lines via ignored_lines instead of silently dropping them.
Regex String Replace	Full Python regex with case-insensitive / multiline / dotall flags and a non-destructive test_mode that highlights matches with >>>…<<<. Returns match_count.
Regex Extract	Returns the first or all regex matches. If the pattern has a capture group, returns the group; otherwise the whole match. all_matches=True emits each match as a separate OUTPUT_IS_LIST item.
Dynamic String Concat	Auto-expanding string concatenator. Has template mode ({1}, {2} placeholders), prefix/suffix, optional whitespace stripping, and an ignore_empty toggle.
String Switch	Routes one of up to 8 string inputs based on a 1-based selector. Lazy: only the chosen branch's upstream nodes are evaluated.
Text Builder	Joins any number of multiline text blocks typed on the node. Blocks are added, toggled, reordered (▲/▼) and removed on the node. A connected text input is always the first part.

MoonPack/lora

Node	Purpose
MoonLoRA Loader	Applies any number of LoRAs to MODEL/CLIP and concatenates the trigger text of the enabled ones into a single STRING.
Dynamic LoRA Stack	Auto-expanding WANVIDLORA stacker (designed for kijai's WanVideoWrapper). Flattens nested lists; an empty stack returns [], not None.

MoonPack/utils

Node	Purpose
Fast Node Bypasser	Adds a toggle widget per controlled node. Connect nodes to control them, or set the matchTitle regex property to auto-match by title. Sort by position / alphanumeric / custom alphabet. Toggle restrictions: default / max one / always one. Right-click for Bypass All / Enable All / Toggle All / Refresh.
Conditional Bypasser	Server-side gate: passes input through when enabled, returns ExecutionBlocker so downstream nodes don't run when disabled. Accepts any data type.

MoonPack/video

Node	Purpose
VACE Looper Frame Mask	Calculates total frames and a kjnodes 'Create Fade Mask Advanced' schedule. Optional images input clamps overlap to half the source length and reports it via was_clamped.
Frame Mask Generator	General-purpose schedule generator. Modes: linear_loop, ping_pong, ease_in_out, fade_in, fade_out, custom.

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Notable Details

Fast Node Bypasser — pattern matching

Set the matchTitle property to a regex (e.g. ^KSampler, (upscale|downscale)) and the bypasser auto-discovers matching nodes. Use the Refresh menu item to re-scan after renaming nodes or changing patterns.

customSortAlphabet accepts either single chars (zyxw…) or comma-delimited prefixes (sdxl,sd,n,p). Nodes whose titles start with the earliest entry come first; ties break alphanumerically.

String Switch — lazy evaluation

MoonPack_StringSwitch declares each input as lazy: True and implements check_lazy_status, so only the upstream graph for the selected branch is evaluated. Use this for prompt A/B tests where each branch may chain expensive generation.

Dynamic String Concat — template mode

If the template widget is non-empty, {1}, {2}, … placeholders are interpolated from input slots and separator is ignored:

template:  "{1}, in the style of {2}"
input_1:   "a cat"
input_2:   "Studio Ghibli"
result:    "a cat, in the style of Studio Ghibli"

Missing slots resolve to an empty string.

MoonLoRA Loader — LoRAs and their trigger words in one node

Each row on the node carries a LoRA and the text that belongs with it, so the two can never drift apart. Toggling a row off removes both the LoRA and its trigger words from the output.

  ⊙ Toggle All                        Strength

 ╭──────────────────────────────────────────────╮
 │ ⬤  style/pixel_v3.safetensors   ◀1.00▶    ✕ │
 │     pixel art, 8bit                          │
 ╰──────────────────────────────────────────────╯

              ➕ Add LoRA

• ➕ Add LoRA opens a filterable list of your local LoRA files.
• Click the filename to swap it, the strength to type a value, or drag the strength sideways to scrub it.
• Click the second line to edit that LoRA's trigger text.
• ✕ removes the row; right-click a row to toggle, reorder or edit it.
• Row order is the order the LoRAs are applied and the order their texts are concatenated.
• The separator widget is inserted verbatim between texts (default ". "). Empty texts and disabled rows contribute nothing.
• Node property Show Strengths switches every row between one strength and separate model/clip strengths.
• CLIP is optional — leave it unconnected for a model-only patch.
• A LoRA whose file has gone missing is skipped with a warning, and its trigger text is dropped with it.

Everything is local. There is no Civitai lookup and no trigger-word scraping; the text is whatever you type, stored in the workflow.

Text Builder — prompt fragments as a stack

Dynamic String Concat joins strings arriving over links. Text Builder owns its text instead: press ➕ Add Text for a block, and each block is a real multiline textarea with its own control strip.

• Toggle — a disabled block keeps its text but contributes nothing, so prompt fragments can be A/B'd without deleting them. Toggle All flips every block at once.
• Name a block — click its #1 caption (or pick Rename from the block's right-click menu) to label it, e.g. #2 lighting. Names are cosmetic; they never reach the output.
• Reorder — ▲ / ▼ on the strip, or Move Up / Move Down in the block's right-click menu. Output order is the order the blocks appear in, not the order they were created.
• Right-click a block — Toggle, Move Up, Move Down and Remove, the same actions as the strip's own buttons.
• text input — optional. When connected it is always the first part and cannot be reordered.
• Joining — parts are joined with separator verbatim (default ,, so a,b; use , for a space). strip_whitespace trims each part and skip_empty drops the ones that end up empty, including the link input, so no stray separators appear.

Conditional Bypasser

Routes any value through when enabled is true; when false, returns an ExecutionBlocker, preventing downstream nodes from executing entirely. Useful for graph-driven branching that depends on upstream conditions.

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Development

# Python nodes
pytest tests/

# Frontend widgets (MoonLoRA Loader) — needs Node, no dependencies
# Text Builder's frontend has no headless checks; verify it in ComfyUI.
node tests/js/run.mjs

License

MIT — see LICENSE.