# extract_json parity probe — Rust vs Go

**Date:** 2026-05-02T09:42:37Z
**Rust helper:** `/home/profit/lakehouse/target/release/parity_extract_json` (links live `gateway::v1::iterate::extract_json`)
**Go helper:** `./bin/parity_extract_json_go` (links live `internal/validator.ExtractJSON`)

Identical model-output strings → both runtimes' `extract_json`.
Match = identical `{matched, value}` JSON output.

**Substrate gate:** `cargo test -p gateway extract_json` PASS before probe.

**Tally:** 12 match · 0 diff (out of 12 fixtures)

_No divergences — extract_json parity holds across all fixtures._