[Home](./index.md) > [@contract-case/case-definition-dsl](./case-definition-dsl.md) > [matchers](./case-definition-dsl.matchers.md) > [objects](./case-definition-dsl.matchers.objects.md) > [ObjectEachKeyMatches](./case-definition-dsl.matchers.objects.objecteachkeymatches.md) > [(constructor)](./case-definition-dsl.matchers.objects.objecteachkeymatches._constructor_.md) ## matchers.objects.ObjectEachKeyMatches.(constructor) Matches an object where each key matches the provided matcher. **Signature:** ```typescript constructor(matcher: AnyMatcherOrData); ``` ## Parameters

Parameter	Type	Description
matcher	AnyMatcherOrData	The matcher that all keys must pass