Help With Assistants API OpenAI

API
1

Hello All, I have an issue with my code, I keep getting different errors when trying to implement Assistant API. My code is attached below:

import dotenv from 'dotenv';
dotenv.config();

import express from 'express';
import axios from 'axios';

const router = express.Router();

const OPENAI_API_KEY = process.env.OPENAI_API_KEY;
const ASSISTANT_ID = 'asst_b4UtFGVw5lkrrSJpud6moq7V'; // Replace with your Assistant ID
const OPENAI_API_BASE_URL = 'https://api.openai.com/v1';

if (!OPENAI_API_KEY) {
    console.error('Error: OPENAI_API_KEY is not set in the environment variables.');
    process.exit(1);
}

router.post('/chat', async (req, res) => {
    try {
        const userMessage = req.body?.message;

        if (!userMessage) {
            return res.status(400).json({ error: 'Message is required' });
        }

        console.log('User message:', userMessage);

        // 🟢 Step 1: Create a thread
        const threadResponse = await axios.post(
            `${OPENAI_API_BASE_URL}/assistants/threads`, 
            {}, // Do NOT send assistant_id here
            {
                headers: {
                    'Authorization': `Bearer ${OPENAI_API_KEY}`,
                    'Content-Type': 'application/json',
                    'OpenAI-Beta': 'assistants=v2' // Ensure Assistants API is enabled
                }
            }
        );

        const threadId = threadResponse?.data?.id;

        if (!threadId) {
            console.error('Failed to create thread: Thread ID is undefined');
            return res.status(500).json({ error: 'Failed to create thread' });
        }

        console.log('Thread ID:', threadId);

        // 🟢 Step 2: Add user message into the thread
        const messageResponse = await axios.post(
            `${OPENAI_API_BASE_URL}/assistants/threads/${threadId}/messages`, 
            {
                role: 'user',
                content: userMessage
            }, 
            {
                headers: {
                    'Authorization': `Bearer ${OPENAI_API_KEY}`,
                    'Content-Type': 'application/json',
                    'OpenAI-Beta': 'assistants=v2' // Ensure Assistants API is enabled
                }
            }
        );

        if (!messageResponse) {
            throw new Error(`Failed to add message to thread ${threadId}`);
        }

        console.log('User message sent to thread:', threadId);

        // 🟢 Step 3: Run the assistant in the thread
        const runResponse = await axios.post(
            `${OPENAI_API_BASE_URL}/assistants/threads/${threadId}/runs`, 
            {
                assistant_id: ASSISTANT_ID // ✅ Send assistant_id here, not in threads
            }, 
            {
                headers: {
                    'Authorization': `Bearer ${OPENAI_API_KEY}`,
                    'Content-Type': 'application/json',
                    'OpenAI-Beta': 'assistants=v2' // Ensure Assistants API is enabled
                }
            }
        );

        const aiResponse = runResponse?.data?.choices?.[0]?.message?.content;

        if (!aiResponse) {
            console.error('No AI response received.');
            return res.status(500).json({ error: 'No AI response received.' });
        }

        console.log('AI Response:', aiResponse);

        res.json({ reply: aiResponse });

    } catch (error) {
        console.error('Error calling OpenAI:', error.response?.data || error.message);
        res.status(500).json({ error: 'API failed: ' + (error.response?.data?.error?.message || error.message) });
    }
});

export default router;

I would appriciate any help on the matter as I dont know JavaScript ( I am a front-end coder) and am ironically relying on ChatGPT for help.

2

Welcome to the dev forum @mehmet.naamani

I’d recommend using the openai-node package and using the boilerplate code from docs

3

Actually, I was interested in your topic but didn’t have the answers myself. I copied and pasted your post in ChatGPT 4o and it provided a lot of instruction on how to set up your environmental variables, API headers, Endpoint URL’s, thread creation, etc. So, ChatGPT4o is very knowledgeable about what you’re asking and there’s a lot to the process - no disrespect to those here who can answer, but maybe it’d worthwhile for you to ask ChatGPT4o itself for the answers?