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

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[Home](./index.md) &gt; [@loopback/express](./express.md) &gt; [MiddlewareGroups](./express.middlewaregroups.md) &gt; [API\_SPEC](./express.middlewaregroups.api_spec.md)

## MiddlewareGroups.API\_SPEC variable

Server OpenAPI specs

<b>Signature:</b>

```typescript
API_SPEC = "apiSpec"
```