Jsonforge: Schema Cards

Before: a candidate JSON Schema tightens one field — say amount must now be greater than zero — and nobody on the team can say which of last month's real payloads would start failing. After: Jsonforge replays every captured payload against both the baseline and the candidate contract and hands you a verdict per file — stable, regression, recovered, or still failing — each backed by exact JSON Pointer evidence and a SHA-256 fingerprint. The workflow is a flight recorder for API contracts. Keep a corpus of observed payloads beside two schema revisions, edit either side in the Schema Bay, and replay the corpus to watch the impact matrix recompute. When it is time to migrate documents, author an RFC 6902 patch in the Patch Lab and apply it with per-operation pre-state evidence and a generated inverse. - Strict RFC 8259 parser that rejects duplicate keys and trailing commas instead of…