heyalice.app — Node.js server example

index.ts

import express from 'express';
import { OpenAI } from 'openai';

const app = express();
const openai = new OpenAI({
  apiKey: 'API_KEY'
});

app.use(express.json());

const getFormattedTimestamp = () => new Date().toISOString();

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

  res.writeHead(200, {
    'Content-Type': 'application/x-ndjson',
    'Transfer-Encoding': 'chunked'
  });

  try {
    const stream = await openai.chat.completions.create({
      model: 'gpt-4',
      messages: req.body.messages,
      stream: true,
    });

    for await (const chunk of stream) {
      const response = {
        model: "gpt-4",
        created_at: getFormattedTimestamp(),
        message: { content: chunk.choices[0]?.delta?.content || '' },
        done: chunk.choices[0]?.delta?.index === null
      };
      res.write(JSON.stringify(response) + '\n');
    }
  } catch (error) {
    console.error('Error processing OpenAI API request:', error);
    res.end();
  }

  res.end();
});

app.listen(3005, () => {
  console.log('Server running on http://localhost:3005');
});