@loopback/docs/site/apidocs/rest.restmiddlewaregroups.md

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---
lang: en
title: 'API docs: rest.restmiddlewaregroups'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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[Home](./index.md) &gt; [@loopback/rest](./rest.md) &gt; [RestMiddlewareGroups](./rest.restmiddlewaregroups.md)

## RestMiddlewareGroups namespace

Built-in middleware groups for the REST sequence

**Signature:**

```typescript
export declare namespace RestMiddlewareGroups 
```

## Variables

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

Variable


</th><th>

Description


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

[API\_SPEC](./rest.restmiddlewaregroups.api_spec.md)


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

Server OpenAPI specs


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

[AUTHENTICATION](./rest.restmiddlewaregroups.authentication.md)


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

Perform authentication


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

[CORS](./rest.restmiddlewaregroups.cors.md)


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

Enforce CORS


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

[DEFAULT](./rest.restmiddlewaregroups.default.md)


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


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

[FIND\_ROUTE](./rest.restmiddlewaregroups.find_route.md)


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

Find the route that can serve the request


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

[INVOKE\_METHOD](./rest.restmiddlewaregroups.invoke_method.md)


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

Invoke the target controller method or handler function


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

[MIDDLEWARE](./rest.restmiddlewaregroups.middleware.md)


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

Default middleware group


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

[PARSE\_PARAMS](./rest.restmiddlewaregroups.parse_params.md)


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

Parse the http request to extract parameter values for the operation


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

[SEND\_RESPONSE](./rest.restmiddlewaregroups.send_response.md)


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

Invoke downstream middleware to get the result or catch errors so that it can produce the http response


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