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github.com/loopbackio/loopback-next/tree/master/docs

loopbackio/loopback-next

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--- lang: en title: 'API docs: metadata.namespacedreflect.definemetadata' keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI sidebar: lb4_sidebar editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/metadata permalink: /doc/en/lb4/apidocs.metadata.namespacedreflect.definemetadata.html --- <!-- Do not edit this file. It is automatically generated by API Documenter. --> [Home](./index.md) &gt; [@loopback/metadata](./metadata.md) &gt; [NamespacedReflect](./metadata.namespacedreflect.md) &gt; [defineMetadata](./metadata.namespacedreflect.definemetadata.md) ## NamespacedReflect.defineMetadata() method define metadata for a target class or it's property/method **Signature:** ```typescript defineMetadata(metadataKey: string, metadataValue: any, target: Object, propertyKey?: string): void; ``` ## Parameters <table><thead><tr><th> Parameter </th><th> Type </th><th> Description </th></tr></thead> <tbody><tr><td markdown="1"> metadataKey </td><td markdown="1"> string </td><td markdown="1"> </td></tr> <tr><td markdown="1"> metadataValue </td><td markdown="1"> any </td><td markdown="1"> </td></tr> <tr><td markdown="1"> target </td><td markdown="1"> Object </td><td markdown="1"> </td></tr> <tr><td markdown="1"> propertyKey </td><td markdown="1"> string </td><td markdown="1"> _(Optional)_ </td></tr> </tbody></table> **Returns:** void