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lang: en
title: 'API docs: rest.restbindings.api_spec'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/rest
permalink: /doc/en/lb4/apidocs.rest.restbindings.api_spec.html
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[Home](./index.md) > [@loopback/rest](./rest.md) > [RestBindings](./rest.restbindings.md) > [API\_SPEC](./rest.restbindings.api_spec.md)
## RestBindings.API\_SPEC variable
Binding key for setting and injecting an OpenAPI spec
<b>Signature:</b>
```typescript
API_SPEC: BindingKey<OpenApiSpec>
```