When a Schema needs arrays with no duplicates or object keys that are generated dynamically but must match naming and type rules, express those constraints with uniqueItems and patternProperties, then validate a short sample locally. uniqueItems works well for SKUs, permissions, and tags. patternProperties is useful for metric_*, feature_*, and env_* dynamic keys.
Schema uniqueness and dynamic key topic
JSON Schema uniqueItems / patternProperties array uniqueness and dynamic key tools
A local workflow for uniqueItems array dedupe, patternProperties dynamic keys, metric_* objects, duplicate SKUs, and pre-release API field constraints.
JSON Schema uniqueItemsJSON Schema patternPropertiesdynamic key validationarray uniqueness validationduplicate SKU schemametric_* field validationJSON Schema dynamic keys
Common lookup scenarios
Find duplicate SKU values in an array
Check whether tags or permissions are unique
Require metric_* dynamic keys to be numbers
Reject wrong casing or unexpected dynamic keys
Review uniqueness and key-name constraints before release
Recommended workflow
- Format the Schema and JSON sample
- Add uniqueItems: true to array fields
- Write patternProperties regex rules and value types
- Run Schema validation and inspect keyword plus instancePath
- Cross-check field shape with key paths, Pointer, JSONPath, and Deep Diff
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A local workflow for uniqueItems array dedupe, patternProperties dynamic keys, metric_* objects, duplicate SKUs, and pre-release API field constraints.
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LookupToolChakanFAQ
When a Schema needs arrays with no duplicates or object keys that are generated dynamically but must match naming and type rules, express those constraints with uniqueItems and patternProperties, then validate a short sample locally. uniqueItems works well for SKUs, permissions, and tags. patternProperties is useful for metric_*, feature_*, and env_* dynamic keys.
Can uniqueItems detect duplicate objects in arrays?
Yes, but object uniqueness is based on the complete JSON value. If only one field such as sku must be unique, extract that field or add a business-level check.
How is patternProperties different from properties?
properties validates fixed key names, while patternProperties uses regular expressions to validate groups of dynamic key names.
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