Setting Up the Dev Environment
Here are the steps to set up a minimal environment for using LLM APIs, for Node.js / Python each.
Node.js Environment
1. Install Node.js
- LTS version (v24+ recommended) from nodejs.org
- Or version-manage with nvm / volta / fnm
2. Create a Project
mkdir my-ai-app && cd my-ai-app npm init -y npm install @anthropic-ai/sdk openai @google/genai npm install -D typescript tsx @types/node npx tsc --init
3. .env and dotenv
npm install dotenv # .env OPENAI_API_KEY=sk-... ANTHROPIC_API_KEY=sk-ant-... GOOGLE_API_KEY=AIza...
4. First Code (TypeScript)
// index.ts
import "dotenv/config";
import Anthropic from "@anthropic-ai/sdk";
const client = new Anthropic();
const msg = await client.messages.create({
model: "claude-opus-4-7",
max_tokens: 256,
messages: [{ role: "user", content: "Hello!" }],
});
console.log(msg.content[0].text);
// Run
npx tsx index.ts
Python Environment
1. Install Python
- Python 3.10+
