ComfyUI API Toolkit bundles Kling AI, ElevenLabs, Google Gemini, and a Utils collection into a single custom node pack so you can stop juggling half a dozen plugins and actually make things. Each service lives in its own module discovered automatically from the filesystem -- add a folder under services/ and it just works. If you don't have a particular SDK installed, that service quietly sits out instead of torching your entire ComfyUI startup. The rest keeps working. You're welcome.

What's Inside

ComfyUI API Toolkit v1.3.0
├── Kling AI         32 nodes   (video, image, audio, effects)
├── ElevenLabs       15 nodes   (TTS, voice cloning, music, transcription)
├── Google Gemini    20 nodes   (entire API covered -- text, image, audio, video, embeddings)
└── Utils             1 node    (pixel art resize)
                  ----------
                    68 nodes total

Services

Kling AI -- 32 nodes

Kling does a lot. Embarrassingly a lot. Video from text, video from images, extend existing videos, lip sync, avatar generation, virtual try-on, motion control, effects, upscaling, audio generation, TTS, and voice cloning. If it involves moving pixels or making sound, there's probably a node for it.

Video

Kling Text to Video
Kling Image to Video
Kling Video Omni
Kling Video Extend
Kling Lip Sync
Kling Advanced Lip Sync
Kling Motion Control
Kling Avatar Generation

Image

Kling Image Generation
Kling Image Omni
Kling Image Extend
Kling Virtual Try-On
Kling AI Multi-Shot
Kling Image Recognize

Audio

Kling Text to Audio
Kling Text to Speech
Kling TTS Advanced
Kling Video to Audio
Kling Voice Clone

Effects & Upscaling

Kling Video Effects
Kling Effect Templates
Kling AI Upscale

Utilities

Kling AI Authentication
Kling Video Loader
Kling Raw File Loader
Kling Raw File Saver
Kling AI Asset Upload
Kling AI Element
Kling Camera Control
Kling Voice Selector
Kling AI Cloud Uploader
Kling Fast Video Saver

ElevenLabs -- 15 nodes

The gold standard for AI voice. Text to speech, speech to speech, voice cloning, voice design, sound effects, music generation, audio isolation, transcription, and multi-speaker dialogue. If you're still using robotic TTS from 2019, this pack is an intervention.

ElevenLabs - API Key
ElevenLabs - Voice Selector
ElevenLabs - Fetch Voices
ElevenLabs - Voice Clone
ElevenLabs - Voice Design
ElevenLabs - Voice Create
ElevenLabs - Text to Speech
ElevenLabs - TTS with Timestamps
ElevenLabs - Speech to Speech
ElevenLabs - Sound Effects
ElevenLabs - Audio Isolation
ElevenLabs - Speech to Text
ElevenLabs - Text to Dialogue
ElevenLabs - Music Generation
ElevenLabs - Account Info

Google Gemini -- 20 nodes

The Gemini service went from "a few image nodes" to covering the entire Gemini API. That means text, vision, image generation via both Gemini and Imagen, image editing, inpainting, outpainting, TTS with 30+ voices, music generation via Lyria, video generation via Veo, and embeddings. If Google offers it through their API, there's a node for it now.

Config -- 6 nodes

Gemini API Key
Gemini Model Selector
Gemini Safety Settings
Gemini Thinking Config
Gemini List Available Models -- queries your API key for what's actually accessible to your account
Gemini Token Counter

Text -- 4 nodes

Gemini Text Generation -- 33 model options across Gemini 3 previews, 2.5, 2.0, and the full Gemma family
Gemini Prompt Refiner
Gemini Multi-Turn Chat
Gemini Structured Output -- JSON-schema constrained generation

Image -- 6 nodes

Gemini Vision Analysis
Gemini Image Generation -- Nano Banana / 2 / Pro via generate_content
Imagen Image Generation -- Imagen 4 Ultra / Standard / Fast via generate_images
Gemini Image Edit
Gemini Inpaint
Gemini Outpaint

Audio -- 2 nodes

Gemini Text-to-Speech -- 30+ prebuilt voices across 3 TTS models
Gemini Music Generation -- Lyria 3 Clip and Pro

Video -- 1 node

Gemini Video Generation -- Veo 3.1, 3.0, 2.0, preview, fast, and lite variants

Embeddings -- 1 node

Gemini Text Embeddings -- 768 to 3072 dimensions with task-type optimization

Full model coverage

| Category | Models | |----------|--------| | Gemini text / multimodal | 13 models (Gemini 3 previews, 2.5, 2.0, latest aliases) | | Gemma open models | 8 models (3-1b through 4-31b) | | Gemini image gen | 3 Nano Banana models | | Imagen | 3 Imagen 4 models (Ultra, Standard, Fast) | | TTS | 3 TTS models + 30 prebuilt voices | | Embeddings | 2 embedding models | | Video | 6 Veo models | | Music | 2 Lyria models | | Specialized | Robotics ER, Computer Use, Deep Research, TTS previews |

Utils -- 1 node

Pixel Art Resize Resizes images to pixel art with proper palette locking across frames for animations. Uses Floyd-Steinberg dithering and scipy KDTree acceleration so palette matching doesn't take all day.

Features Worth Knowing About

Auto-discovery for services Services are discovered from the filesystem. Drop a folder under services/ and it loads. Nothing to register, nothing to hardcode.

Graceful service fallback Don't have google-genai installed? Gemini nodes don't load. Everything else does. Same deal for Kling and ElevenLabs. Install what you need, ignore what you don't.

Shared retry logic with exponential backoff All API nodes retry on transient failures. They back off intelligently instead of hammering the API until it blocks you. Rate limits happen; the nodes handle it.

API keys are password-masked Your keys don't show up in plaintext in your workflow. Share screenshots without accidentally donating your API credits to strangers.

Environment variable fallback Set KLING_ACCESS_KEY + KLING_ACCESS_SECRET, ELEVENLABS_API_KEY, or GEMINI_API_KEY in your environment and the auth nodes will pick them up automatically. Good for automation, good for not hardcoding secrets.

IS_CHANGED on all API nodes ComfyUI caches node outputs. API nodes that cache are useless. Every API node here implements IS_CHANGED so you get fresh results every time you queue, not whatever you got the last time.

Tooltips on every parameter Hover over any input and there's a tooltip explaining what it does. Shockingly underrated feature.

Output directory auto-creation If your output path doesn't exist, it gets created. No silent failures because someone forgot to mkdir.

Cloud uploader auto-fallback The cloud uploader tries catbox first, falls back to tmpfiles if it fails. Assets get uploaded regardless.

Installation

ComfyUI Manager (easiest) Search for "API Toolkit" and install. Done.

Registry

comfy node registry-install comfyui-api-toolkit

Manual

cd ComfyUI/custom_nodes
git clone https://github.com/IxMxAMAR/ComfyUI-API-Toolkit
cd ComfyUI-API-Toolkit
pip install -r requirements.txt

Dependencies

Install all services at once:

pip install requests PyJWT soundfile scipy "google-genai>=0.8.0"

Or pick what you actually use:

# Kling only
pip install requests PyJWT

# ElevenLabs only
pip install requests soundfile scipy

# Gemini only
pip install "google-genai>=0.8.0"

The pack uses optional dependencies, so you're not forced to install Google's SDK just because you want to run some TTS.

Also Available Separately

Prefer to install just one service? Each service is published as its own standalone package:

| Package | Service | |---------|---------| | ComfyUI-Kling-Direct | Kling AI | | ComfyUI-ElevenLabs-Pro | ElevenLabs | | ComfyUI-NanoBanana2 | Google Gemini |

Same nodes, same quality, just smaller installs if you only need one thing.

Requirements

ComfyUI (recent enough to support custom nodes, which if you're reading this you probably already have)
Python 3.10+
API keys for whichever services you want to use

License

MIT. Use it, fork it, build on it.

Made by IxMxAMAR