---
lang: en
title: 'API docs: context.inject.setter'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/context
permalink: /doc/en/lb4/apidocs.context.inject.setter.html
---

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[Home](./index.md) &gt; [@loopback/context](./context.md) &gt; [inject](./context.inject.md) &gt; [setter](./context.inject.setter.md)

## inject.setter() function

Inject a function for setting (binding) the given key to a given value. (Only static/constant values are supported, it's not possible to bind a key to a class or a provider.)

This is useful e.g. when implementing Actions that are contributing new Elements.

See also `Setter<T>`<!-- -->.

**Signature:**

```typescript
setter: (bindingKey: BindingAddress, metadata?: InjectBindingMetadata) => (target: Object, member: string | undefined, methodDescriptorOrParameterIndex?: number | TypedPropertyDescriptor<any> | undefined) => void
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

bindingKey


</td><td markdown="1">

[BindingAddress](./context.bindingaddress.md)


</td><td markdown="1">

The key of the value we want to set.


</td></tr>
<tr><td markdown="1">

metadata


</td><td markdown="1">

[InjectBindingMetadata](./context.injectbindingmetadata.md)


</td><td markdown="1">

_(Optional)_ Optional metadata to help the injection


</td></tr>
</tbody></table>

**Returns:**

(target: Object, member: string \| undefined, methodDescriptorOrParameterIndex?: number \| TypedPropertyDescriptor&lt;any&gt; \| undefined) =&gt; void