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Structured Output From LLMs: A Retry-Repair Loop Your Parser Never Sees Through

This story is from 2026-09-05. It is preserved in the archive; the latest stories are on the live feed.

The first time I wired an LLM into a real product feature at Shpper, I did the naive thing: prompt the model to "return JSON", jsonDecode the response, move on. It worked in the demo. Then it hit real traffic and I started getting FormatException at 2am because the model wrapped its JSON in a ```js…

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  1. 2026-09-05 22:42 · DEV Community — Machine Learning
    Structured Output From LLMs: A Retry-Repair Loop Your Parser Never Sees Through

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