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How to Call Grob from Node.js

Send requests to a local Grob proxy using the official @anthropic-ai/sdk and openai Node SDKs. The proxy listens on http://[::1]:13456 (IPv6 localhost) by default and accepts both Anthropic /v1/messages and OpenAI /v1/chat/completions traffic.

Install

npm install @anthropic-ai/sdk openai

Run the script

The recommended entry point is grob exec. It auto-starts the proxy, exports ANTHROPIC_BASE_URL and OPENAI_BASE_URL, and stops the server when the script exits.

grob exec -- node script.mjs

If Grob already runs, point the SDK at the proxy via baseURL. The apiKey field is a placeholder header — Grob authenticates with the upstream provider via OAuth or stored secrets, so any non-empty string works.

Anthropic SDK, non-streaming

import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  baseURL: "http://[::1]:13456",
  apiKey: "grob-local", // placeholder; Grob handles real auth
});

const message = await client.messages.create({
  model: "claude-sonnet-4-6",
  max_tokens: 256,
  messages: [{ role: "user", content: "Summarize the Rust borrow checker in one sentence." }],
});
console.log(message.content[0].text);

OpenAI SDK, streaming

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "http://[::1]:13456/v1",
  apiKey: "grob-local",
});

const stream = await client.chat.completions.create({
  model: "gpt-5.4",
  messages: [{ role: "user", content: "Stream a haiku about caching." }],
  stream: true,
});

for await (const chunk of stream) {
  const delta = chunk.choices[0]?.delta?.content;
  if (delta) {
    process.stdout.write(delta);
  }
}

See also