Install

npm install @anthropic-ai/sdk

Configure the client

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

const anthropic = new Anthropic({
  apiKey: process.env.UOUODUO_API_KEY,
  baseURL: "https://uouo.cloud/v1",
});

Messages

const message = await anthropic.messages.create({
  model: "claude-3-5-sonnet-latest",
  max_tokens: 512,
  system: "You are a careful code review assistant.",
  messages: [
    { role: "user", content: "Compress this launch checklist into three points." },
  ],
});

console.log(message.content);

Streaming

const stream = await anthropic.messages.stream({
  model: "claude-3-5-sonnet-latest",
  max_tokens: 512,
  messages: [{ role: "user", content: "Explain the SSE event order." }],
});

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

Production notes

• Messages requests require `max_tokens`.
• Keep `system` outside `messages`.
• Use a dedicated key for Claude-compatible traffic if you want clean log filters.
• Handle mid-stream interruptions before writing partial output into business data.