Add Model Fallback to an OpenAI-Compatible Node.js App

A developer demonstrates how to add model fallback to an OpenAI-compatible Node.js application using the official OpenAI JavaScript package. The approach tries one model first and switches to a second only on failure, with code examples and guidance on handling errors and checking available models via the JinzeAI endpoint.

A single model can be unavailable, rate-limited, or temporarily slow. If your application already uses an OpenAI-compatible API, a simple fallback can make testing more resilient without introducing another SDK. This tutorial uses Node.js and the official OpenAI JavaScript package. It tries one model first and switches to a second model only when the first request fails. npm install openai On macOS or Linux: export JINZEAI API KEY="your api key here" On PowerShell: $env:JINZEAI API KEY="your api key here" Never commit a real API key. Rotate it immediately if it appears in a public repository, screenshot, or support message. python import OpenAI from "openai"; const client = new OpenAI { baseURL: "https://jinzeai.cc/v1", apiKey: process.env.JINZEAI API KEY, } ; js const models = "deepseek-chat", "qwen-flash" ; async function completeWithFallback messages { let lastError; for const model of models { try { const response = await client.chat.completions.create { model, messages, } ; return { model, text: response.choices 0 .message.content, }; } catch error { lastError = error; console.warn ${model} failed: ${error.status ?? "unknown status"} ; } } throw lastError; } const result = await completeWithFallback { role: "user", content: "Explain model fallback in one sentence.", }, ; console.log Model: ${result.model} ; console.log result.text ; The minimal example retries on every error so the control flow is easy to see. A production application should be more selective. Fallback may be reasonable for: Do not silently retry authentication errors. An HTTP 401 usually means the key is missing, inactive, or formatted incorrectly. Fix the key instead of sending the same invalid request to another model. Available beta models can change. Use your key with GET /v1/models rather than assuming every model is enabled for every account. curl https://jinzeai.cc/v1/models \ -H "Authorization: Bearer $JINZEAI API KEY" JinzeAI is testing an OpenAI-compatible endpoint for users outside mainland China. No payment is required during the public beta, and limited free test credit may be available. Model availability and test limits may change during beta. Feedback about SDK compatibility, latency, and failure handling is especially useful.