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Valid JSON, Stale Values: Field Notes From a 48-Hour Schema Guard on a Free Model

This story is from 2026-08-28. It is preserved in the archive; the latest stories are on the live feed.

Parsing JSON is the easiest part of working with a generative model, yet most pipelines stop right there and declare victory. For 48 hours I ran a scheduled job that asked a free model to squeeze messy input into a three-key JSON envelope, and the parser passed while the data lied. The guard script…

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  1. 2026-08-28 23:50 · DEV Community — AI
    Valid JSON, Stale Values: Field Notes From a 48-Hour Schema Guard on a Free Model

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