API response schema mismatch fix
Schema mismatch means runtime objects no longer match your contract: types drift, keys rename, nullability changes. Catch drift in CI with schema validation against recorded samples.
Common causes
- OpenAPI out of date vs production.
- Nullable fields became required.
- Clients assume arrays always present.
How to fix
- Validate samples in Response Schema Validator.
- Regenerate client from OpenAPI Validator output.
- Version endpoints or use additive-only changes.
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Validate response schemaRelated