n8n-nodes-lmstudio

An n8n community node for LM Studio — run local LLMs with optional JSON schema for structured outputs.

Features

• Dynamic model selector — fetches available models from your LM Studio server, shows loaded/unloaded state and quantization info
• Structured JSON output — provide a JSON schema and get validated, parsed responses
• Usable as a tool — can be used as a tool node in n8n AI agent workflows

Installation

In n8n (recommended)

1. Go to Settings > Community Nodes
2. Select Install a community node
3. Enter n8n-nodes-lmstudio
4. Agree to the risks and click Install

Manual

npm install n8n-nodes-lmstudio

Configuration

Credential: LM Studio API

| Field | Description | Default | |----------|------------------------------------------------|------------------------| | Host URL | LM Studio server URL with protocol and port | http://localhost:1234 | | API Key | Optional API key (leave empty if not required) | |

The credential tests connectivity by hitting your server's /api/v0/models endpoint.

Node: LM Studio Simple Message

| Parameter | Description | |-----------------|----------------------------------------------------------| | Model | Select from available LLM/VLM models on your server | | Message | The user message to send | | JSON Schema | Optional JSON schema for structured output | | Temperature | Controls randomness (0–2, default 0.3) | | Max Tokens | Maximum tokens to generate (empty = model default) | | Timeout | Request timeout in seconds (0 = no timeout) |

Development

npm install
npm run build
npm run dev          # start n8n with hot reload
npm run lint         # check for errors
npm test             # run unit tests
npm run test:integration  # run integration tests (requires LM Studio)

Integration tests require a running LM Studio server:

LM_STUDIO_URL=http://localhost:1234 npm run test:integration

Acknowledgments

This project was developed with assistance from Claude, Anthropic's AI assistant.

License

MIT