TypeError: openai.createChatCompletion is not a function | OpenAI | Page 1

I am trying to implement a feature where users can input their own api and this is how i implement it:

import express from 'express';
import * as dotenv from 'dotenv';
import cors from 'cors';
import { Configuration, OpenAIApi } from 'openai';

dotenv.config();

const app = express();
app.use(cors());
app.use(express.json());

app.get('/', async (req, res) => {
  res.status(200).send({
    message: 'Hello!',
  })
});

app.post('/', async (req, res) => {

  try {

    const prompt = req.body.prompt;
    const bot_type = req.body.bot_type;
    const API_KEY = req.body.custom_api || process.env.OPENAI_API_KEY;


    const configuration = new Configuration({
      apiKey: API_KEY,
    });

    const openai = new OpenAIApi(configuration);

    const response = await openai.createChatCompletion({
      model: "gpt-3.5-turbo",
      messages: [
        //messages here blah blah..
      ],
      temperature: 0.2,
      max_tokens: 1500,
      top_p: 1,
      frequency_penalty: 0,
      presence_penalty: 0,
    });

    console.error(response.data.choices[0].message.content)
    res.status(200).send({
      bot: response.data.choices[0].message.content
    });

  } catch (error) {
    console.error(error)
    res.status(500).send(error || `Something went wrong, please try again.`);
  }

})

app.listen(5500, () => console.log('AI server started on http://localhost:5500'))

#TypeError: openai.createChatCompletion is not a function