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LLM Returns Invalid JSON Once in a While: Structured Outputs vs Validate-and-Retry

TL;DR: If json.loads() on model output fails only occasionally, there are three distinct causes: truncation, stray prose or code fences around the JSON, and schema drift (valid JSON, wrong shape). Provider-side structured outputs (constrained decoding) eliminate the second and third for supported s…

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  1. 2026-11-06 22:31 · DEV Community — AI
    LLM Returns Invalid JSON Once in a While: Structured Outputs vs Validate-and-Retry

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