How do you handle LLM hallucinations in a document extraction pipeline?

How do you handle LLM hallucinations in a document extraction pipeline?medium

Type: scenario
Topic: do-you-handle-llm-hallucinations-in-a-document-extraction
Frequency: common
Tags: llms, how, you, handle, llm, hallucinations

Answer

(1) Constrained output — JSON-only with defined schema, return null for absent fields.

Explanation

(1) Constrained output — JSON-only with defined schema, return null for absent fields. (2) Pydantic validation — parse and validate every response, reject malformed outputs. (3) Confidence scoring — ask model to output confidence per field. (4) Grounding check — verify extracted values exist in source text. (5) Human review queue for low-confidence outputs (HITL).

Follow-upCan you give a production example?