PayloadWatch / A repeatable review
Catch the shape change before it spreads.
Turn an expected JSON payload into a saved contract. Check new samples locally, then keep a history of missing fields and changed types.
Opening your workspace…
Make a deliberate change
- Build a contract from a representative sample, then mark fields that may be absent.
- Save it to your account and test a changed payload.
- If the provider’s change is intended, review a new baseline and save a new contract revision. Historical results keep their original revision.
A structure check, with clear limits
This beta checks types, presence and additional paths. It does not validate string formats, value ranges, authentication headers, event delivery or business outcomes. Array fields are combined with missing-item coverage; an empty array cannot prove its item shape.
No AI calls, credentials or payload values are needed. Sample JSON stays in this tab; saving a contract stores paths and types. Get help · Data and account controls