Minimal ChatGPT request to the OpenAI-API

ChatGPT.mjs

// This code sends a prompt to the OpenAI API and then outputs the response
// to the terminal and to a file. 

// Setup:
// npm init -y && npm i dotenv node-fetch
// echo "OPENAI_API_KEY=sk-XXX" > .env

import fs from "fs";
import fetch from "node-fetch";
import * as dotenv from "dotenv";
dotenv.config();
const { OPENAI_API_KEY } = process.env;

const prompt = `please write me a hello-world program in JavaScript`;

const requestOptions = {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    Authorization: `Bearer ${OPENAI_API_KEY}`,
  },
  body: JSON.stringify({
    model: "gpt-3.5-turbo",
    // temperature: 0, // to have no randomnes
    messages: [
      {
        role: "system",
        content: `You are ChatGPT, a large language model trained by OpenAI. Answer as concisely as possible. Knowledge cutoff: 2021-09-01. Current date: ${new Date()
          .toISOString()
          .slice(0, 10)}`,
      },
      { role: "user", content: prompt.trim() },
    ],
  }),
};

console.log("start");

fetch("https://api.openai.com/v1/chat/completions", requestOptions)
  .then((response) => response.json())
  .then((data) => {
    fs.writeFileSync("out.json", JSON.stringify(data, null, 2));

    // write raw answer to file
    let answer = data.choices[0].message.content;
    fs.writeFileSync("out.txt", answer);

    console.log(answer);
    console.log("done");
  })
  .catch((error) => console.error(error));