A simple way to test model fallbacks with RouterBase

Title: A simple way to test model fallbacks with RouterBase

URL Source: https://dev.to/routerbasecom/a-simple-way-to-test-model-fallbacks-with-routerbase-5d85

Published Time: 2026-07-01T02:47:06Z

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Posted on Jul 1

# A simple way to test model fallbacks with RouterBase

[#ai](https://dev.to/t/ai)[#api](https://dev.to/t/api)[#llm](https://dev.to/t/llm)[#tutorial](https://dev.to/t/tutorial)

Fallback logic is easier to reason about when the application has one request shape and the model choice stays configurable. That is especially useful for teams testing different AI providers, latency profiles, or cost envelopes.

[RouterBase](https://routerbase.com/) gives developers an OpenAI-compatible API surface at `https://routerbase.com/v1`, which makes it a good place to prototype fallback behavior before changing a larger production system.

## [](https://dev.to/routerbasecom/a-simple-way-to-test-model-fallbacks-with-routerbase-5d85#a-tiny-fallback-wrapper) A tiny fallback wrapper

```
const baseUrl = "https://routerbase.com/v1/chat/completions";

async function runPrompt(model, prompt) {

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