Fallback Lab · Demo

Try providers until one works.

A visual playground for the tiny @khalidsaidi/fallback-chain-js library. Fetch a page, summarize it with Vertex AI, and inspect every attempt in the chain.

Run a fallback chain

Try providers in order. Watch each attempt and see why a fallback happened.

Demo Mode

URL

Question

Demo Mode (skip auth + storage)

Result

Answer plus attempt timeline.

Run a query to see the fallback timeline.