@loopback/docs/site/apidocs/express.middlewarebindingoptions.upstreamgroups.md

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---
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title: 'API docs: express.middlewarebindingoptions.upstreamgroups'
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[Home](./index.md) &gt; [@loopback/express](./express.md) &gt; [MiddlewareBindingOptions](./express.middlewarebindingoptions.md) &gt; [upstreamGroups](./express.middlewarebindingoptions.upstreamgroups.md)

## MiddlewareBindingOptions.upstreamGroups property

An array of group names for upstream middleware in the cascading order.

For example, the `invokeMethod` depends on `parseParams` for request processing. The `upstreamGroups` for `invokeMethod` should be `['parseParams']`<!-- -->. The order of groups in the array does not matter.

<b>Signature:</b>

```typescript
upstreamGroups?: string | string[];
```