---
lang: en
title: 'API docs: rest.restserver.getapispec'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.rest.restserver.getapispec.html
---

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[Home](./index.md) &gt; [@loopback/rest](./rest.md) &gt; [RestServer](./rest.restserver.md) &gt; [getApiSpec](./rest.restserver.getapispec.md)

## RestServer.getApiSpec() method

Get the OpenAPI specification describing the REST API provided by this application.

This method merges operations (HTTP endpoints) from the following sources: - `app.api(spec)` - `app.controller(MyController)` - `app.route(route)` - `app.route('get', '/greet', operationSpec, MyController, 'greet')`

<b>Signature:</b>

```typescript
getApiSpec(): OpenApiSpec;
```
<b>Returns:</b>

`OpenApiSpec`


