When an API field is conditional, a payment method is mutually exclusive, or contact fields must be valid email or URL values, required and type checks are not enough. Validate oneOf, const, additionalProperties, and format with JSON Schema, then confirm real paths with key paths, JSON Pointer, JSONPath, and Deep Diff to decide whether the schema is too strict, outdated, or the payload is truly incompatible.
JSON Schema oneOf / format topic
JSON Schema oneOf / format compatibility, mutually exclusive fields, and email URL validation tools
A release-review workflow for oneOf branch conflicts, mutually exclusive fields, const rules, email/uri/date format errors, and API Schema compatibility checks.
JSON Schema oneOf validationJSON Schema format erroremail format validationuri format validationmutually exclusive field validationoneOf branch conflictAPI Schema compatibility
Common lookup scenarios
payment.method=card but bankAccount is sent, so no oneOf branch matches
email, callbackUrl, or date-time format fails before release
Mutually exclusive fields appear together and break validation
Use key paths to confirm real contact-field locations
Compare v1/v2 responses before relaxing or upgrading a schema
Recommended workflow
- Format the Schema and JSON sample first
- Validate oneOf, const, required, additionalProperties, and format
- Read error paths and keywords to separate branch conflicts from format errors
- Verify real field locations with key paths, Pointer, and JSONPath
- Use Deep Diff on version changes before updating API docs
Related tool entries
A release-review workflow for oneOf branch conflicts, mutually exclusive fields, const rules, email/uri/date format errors, and API Schema compatibility checks.
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LookupToolChakanFAQ
When an API field is conditional, a payment method is mutually exclusive, or contact fields must be valid email or URL values, required and type checks are not enough. Validate oneOf, const, additionalProperties, and format with JSON Schema, then confirm real paths with key paths, JSON Pointer, JSONPath, and Deep Diff to decide whether the schema is too strict, outdated, or the payload is truly incompatible.
How is oneOf different from anyOf?
oneOf requires exactly one branch to match, while anyOf allows one or more branches. Payment methods, mutually exclusive fields, and single business variants often start with oneOf checks.
Does a format error always mean the data is unusable?
No. Format validation is a pre-release signal. Confirm whether the business rule really requires strict email, uri, date-time, or uuid values.
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