How can I implement the Assistant API in an Express Node.js server without configuration errors?

Below is some guidance to help you move forward:

Official Guidance for API Endpoints

Our documentation focuses on creating API endpoints using an edge runtime (such as with Next.js), and we provide a code sample similar to the snippet below:

TSCopied
import { openai } from "@ai-sdk/openai";
import { createEdgeRuntimeAPI } from "@assistant-ui/react/edge";

export const { POST } = createEdgeRuntimeAPI({
  model: openai("gpt-4o"),
});

If you’re using Express, you can adapt these ideas. Note that the SDK is optimized for edge runtimes, so some patterns (like instantiating configuration) might differ when used with Express.

Adapting for Express

A conceptual example using Express might look like this:

JSCopied
import express from "express";
import { openai } from "@ai-sdk/openai";

const app = express();
const port = 3000;

// Make sure to parse JSON bodies
app.use(express.json());

// Initialize your model
const model = openai("gpt-4o");

app.post("/api/chat", async (req, res) => {
  try {
    // This is a sample; adjust the API call as recommended by SDK docs.
    const response = await model.chat(req.body);
    res.json(response);
  } catch (error) {
    console.error("Error handling chat request:", error);
    res.status(500).json({ error: error.message });
  }
});

app.listen(port, () => {
  console.log(`Express server is running on port ${port}`);
});

Double-check that your environment variables (like the API key) are correctly set:

ENVCopied
OPENAI_API_KEY="sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

Additional Resources

• Custom REST API Guide: Our documentation includes a section detailing how to integrate a custom REST API with the assistant-ui framework. This guide explains initial project setup and necessary configurations that may offer further insights for your Express implementation.

• Community Support: Consider joining our community Discord or GitHub discussions, where similar issues have been raised. Our community can offer additional insights on adapting the SDK to Express.

Debugging the "Configuration is not a constructor" Error

That particular error often indicates that a part of the SDK isn’t being instantiated in the expected environment or manner. When integrating with Express, ensure that:

• You’re importing and initializing the SDK components as documented.
• Your code isn’t mixing patterns meant for edge runtimes (like Next.js API routes) with the express pattern.
• All required environment variables are provided.

If adaptation challenges persist, reviewing the Custom REST API integration guide in our docs might offer further clarification on how to structure your backend.

I hope this helps you move forward with your project. If you have follow-up questions regarding how to adapt specific parts of the SDK for your Express setup, feel free to ask!