"Error processing request: Error: Invalid response structure from OpenAI"

API
1 
const express = require('express');
const OpenAI = require('openai').default;
const app = express();
const port = 3000;

const openai = new OpenAI({
    apiKey: process.env.OPENAI_API_KEY,
});

app.use(express.json());

app.post('/api/send', async (req, res) => {
    console.log("Received request with body:", req.body);

    try {
        const chatCompletion = await openai.chat.completions.create({
            model: "gpt-3.5-turbo",
            messages: [{ role: 'user', content: req.body.message }],
        });

        console.log("OpenAI API full response:", chatCompletion);

        if (chatCompletion.data && chatCompletion.data.choices) {
            const firstChoice = chatCompletion.data.choices[0];
            console.log("First choice message object:", firstChoice.message);
            res.status(200).json({ response: firstChoice.message.content });
        } else {
            console.error('Unexpected response structure from OpenAI:', chatCompletion);
            res.status(500).send('Error: Unexpected response structure from OpenAI');
        }
    } catch (error) {
        console.error('Error processing request:', error);
        res.status(500).send('Error processing your request');
    }
});

app.listen(port, () => {
    console.log(`Server running on http://localhost:${port}`);
});
2

Check the type of object you are receiving and its structure right before the line where the error happens.