Fetch OpenAI API code snippet in JS

openai-gpt-3.5-turbo.js

  try {
    const GPT_KEY = process.env.CHATGPT_API_KEY;
    
    const headers = {
      'Content-Type': 'application/json',
      Authorization: `Bearer ${GPT_KEY}`,
    };

    const prompt = req.query.text;

    const response = await fetch('https://api.openai.com/v1/chat/completions', {
      method: 'POST',
      headers,
      body: JSON.stringify({
        model: 'gpt-3.5-turbo',
        messages: [
          {
            role: 'user',
            content: prompt,
          },
        ],
        temperature: 0,
        max_tokens: 550,
      }),
    });

    console.log(`${prompt}`);

    const { choices } = await response.json();
    const [message] = choices;

    const text =
      prompt + message.message.content.replace(/(?:\r\n|\r|\n)/g, '
');    

    return text;
  } catch (error) {
    throw new Error(error.message);
  }      

text-davinci-003.js

  try {
    const GPT_KEY = process.env.CHATGPT_API_KEY;
    
    const headers = {
      'Content-Type': 'application/json',
      Authorization: `Bearer ${GPT_KEY}`,
    };

    const prompt = req.query.text;

    const response = await fetch('https://api.openai.com/v1/completions', {
      method: 'POST',
      headers,
      body: JSON.stringify({
        model: 'text-davinci-003',
        prompt: prompt,
        temperature: 0,
        max_tokens: 550,
      }),
    });

    const reply = await response.json();
    const choice = reply.choices[0].text;

    const text = prompt + choice.replace(/(?:\r\n|\r|\n)/g, '
');

    return text;
  } catch (error) {
    throw new Error(error.message);
  }