chat.js

import { Configuration, OpenAIApi } from "openai";
import NextCors from 'nextjs-cors';

const configuration = new Configuration({
  apiKey: process.env.NEXT_PUBLIC_OPENAI_KEY,
});

const openai = new OpenAIApi(configuration);

export default async function handler(req, res) {
    // Create our CORS policy to allow remote hosts
    await NextCors(req, res, {
    methods: ['POST', 'HEAD'],
    origin: '*',
    optionsSuccessStatus: 200,
    });

    // Destruct request body
    const { prompt, token } = req.body;

    // Validate our API token from Twilio
    if (token !== process.env.NEXT_PUBLIC_API_KEY) {
    res.status(403).send("HTTP 403 / Unauthorized");

    return;
    }

    // Make our API request to ChatGPT and send the result to Twilio
    try {
    const completion = await openai.createCompletion({
        model: "text-davinci-003", // ChatGPT latest version
        prompt: prompt,
        max_tokens: 2048 // Max length of response (2048 is highest)
    });

    const result = completion?.data?.choices[0]?.text;

    if (result) {
        res.status(200).json({ result: result });
    } else {
        const error = completion?.data?.error;
        console.log(error);
        res.status(200).json({ result: "I'm sorry, an error occurred." });
    }
    } catch (e) {
    console.log(e)
    res.status(200).json({ result: "I'm sorry, an error occured." });
    }

    return;
}