Authentication

Requires LM Studio 0.4.0 or newer.

LM Studio supports API Tokens for authentication, providing a secure and convenient way to access the LM Studio API.

By default, the LM Studio API runs without enforcing authentication. For production or shared environments, enable API Token authentication for secure access.

Providing the API Token

There are two ways to provide the API Token when creating an instance of LMStudioClient:

• Environment Variable (Recommended): Set the LM_API_TOKEN environment variable, and the SDK will automatically read it.
• Function Argument: Pass the token directly as the apiToken parameter in the constructor.

// Set environment variables in your terminal before running the code:
// export LM_API_TOKEN="your-token-here"

import { LMStudioClient } from "@lmstudio/sdk";
// The SDK automatically reads from LM_API_TOKEN environment variable
const client = new LMStudioClient();

const model = await client.llm.model("qwen/qwen3-4b-2507");
const result = await model.respond("What is the meaning of life?");

console.info(result.content);