@loopback/docs
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Documentation for LoopBack 4
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---
lang: en
title: 'API docs: metadata'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.metadata.html
---
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[Home](./index.md) > [@loopback/metadata](./metadata.md)
## metadata package
[@loopback/metadata](https://github.com/strongloop/loopback-next/tree/master/packages/metadata)
## Classes
| Class | Description |
| --- | --- |
| [ClassDecoratorFactory](./metadata.classdecoratorfactory.md) | Factory for class decorators |
| [DecoratorFactory](./metadata.decoratorfactory.md) | Base factory class for decorator functions |
| [MetadataAccessor](./metadata.metadataaccessor.md) | A strongly-typed metadata accessor via reflection |
| [MetadataInspector](./metadata.metadatainspector.md) | Inspector for metadata applied by decorators |
| [MethodDecoratorFactory](./metadata.methoddecoratorfactory.md) | Factory for method decorators |
| [MethodParameterDecoratorFactory](./metadata.methodparameterdecoratorfactory.md) | Factory for method level parameter decorator. |
| [NamespacedReflect](./metadata.namespacedreflect.md) | |
| [ParameterDecoratorFactory](./metadata.parameterdecoratorfactory.md) | Factory for parameter decorators |
| [PropertyDecoratorFactory](./metadata.propertydecoratorfactory.md) | Factory for property decorators |
## Interfaces
| Interface | Description |
| --- | --- |
| [DecoratorOptions](./metadata.decoratoroptions.md) | Options for a decorator |
| [DesignTimeMethodMetadata](./metadata.designtimemethodmetadata.md) | Design time metadata for a method. |
| [InspectionOptions](./metadata.inspectionoptions.md) | Options for inspection |
| [MetadataMap](./metadata.metadatamap.md) | An object mapping keys to corresponding metadata |
## Variables
| Variable | Description |
| --- | --- |
| [Reflector](./metadata.reflector.md) | |
## Type Aliases
| Type Alias | Description |
| --- | --- |
| [DecoratorType](./metadata.decoratortype.md) | Decorator function types |
| [MetadataKey](./metadata.metadatakey.md) | Key for metadata access via reflection |