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OpenAI SDK

The OpenAI Node.js SDK works out of the box.

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Installation

npm install openai

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Basic Usage

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.arouter.com/v1",
  apiKey: "lr_live_xxxx",
});

const response = await client.chat.completions.create({
  model: "gpt-4o",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);

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Multi-Provider

// Anthropic via OpenAI SDK
const response = await client.chat.completions.create({
  model: "anthropic/claude-sonnet-4-20250514",
  messages: [{ role: "user", content: "Hello!" }],
});

// DeepSeek via OpenAI SDK
const response = await client.chat.completions.create({
  model: "deepseek/deepseek-chat",
  messages: [{ role: "user", content: "Hello!" }],
});

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Streaming

const stream = await client.chat.completions.create({
  model: "gpt-4o",
  messages: [{ role: "user", content: "Write a poem." }],
  stream: true,
});

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

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Anthropic SDK

The Anthropic Node.js SDK works natively.

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Installation

npm install @anthropic-ai/sdk

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Basic Usage

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

const client = new Anthropic({
  baseURL: "https://api.arouter.com",
  apiKey: "lr_live_xxxx",
});

const message = await client.messages.create({
  model: "claude-sonnet-4-20250514",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(message.content[0].text);

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Streaming

const stream = client.messages.stream({
  model: "claude-sonnet-4-20250514",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Tell me a story." }],
});

for await (const event of stream) {
  if (event.type === "content_block_delta" && event.delta.type === "text_delta") {
    process.stdout.write(event.delta.text);
  }
}

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ARouter SDK

The first-party @arouter/sdk provides additional features like key management and usage tracking.

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Installation

npm install @arouter/sdk

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Chat Completion

import { ARouter } from "@arouter/sdk";

const router = new ARouter({
  apiKey: "lr_live_xxxx",
  baseURL: "https://api.arouter.com",
});

const response = await router.chatCompletion({
  model: "gpt-4o",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);

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Streaming

const stream = await router.chatCompletionStream({
  model: "gpt-4o",
  messages: [{ role: "user", content: "Write a haiku." }],
});

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

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Key Management

Use a management key (lr_mgmt_) to create and manage API keys. 
const mgmt = new ARouter({
  apiKey: "lr_mgmt_xxxx",
  baseURL: "https://api.arouter.com",
});

const key = await mgmt.createKey({
  name: "backend-service",
  allowed_providers: ["openai", "anthropic"],
  limit: 150,
  limit_reset: "monthly",
});
console.log("API Key:", key.key);

const keys = await mgmt.listKeys();
console.log("Keys:", keys.data);

await mgmt.updateKey(key.data.hash, { disabled: true });

await mgmt.deleteKey(key.data.hash);