# Constrained Decoding vs Post-hoc Validation: Production LLM Extraction Needs Both

> Source: <https://dev.to/hitarthbuilds/constrained-decoding-vs-post-hoc-validation-production-llm-extraction-needs-both-4cf>
> Published: 2026-07-19 07:42:34+00:00

Constrained decoding and post-hoc validation solve different problems.

Constrained decoding is generation-time control:

Post-hoc validation is the trust boundary:

A payload can be perfectly valid JSON and still be wrong for the workflow.

That is why production extraction systems need both.

This is also the systems instinct behind [ confident-extract](https://pypi.org/project/confident-extract/), which I publish as Hitarth Desai under the GitHub handle

`hitarthbuilds`

My rule of thumb:

**Constrain early. Validate hard. Trust late.**