I added an AI helper to my JSON mock-API tool — the hybrid design, and a Workers AI gotcha

I run TempTools — a small suite of free, no-signup web tools that expire and delete themselves. The one I use most is Temp API: paste JSON or CSV, get a live mock endpoint in seconds.

I just added an AI helper to it, and the design turned out more interesting than "call an LLM." The rule I set for myself was: AI is never allowed to touch correctness. Here's how that shook out — plus a Cloudflare Workers AI gotcha that broke two of the three features while the third worked fine.

What the helper does

Three buttons on the Temp API editor:

Fix & format — clean up messy/broken JSON and explain what changed