# hasCollection()
This method checks if a specified collection exists.

## Invocation 
```javascript
new milvusClient(MILUVS_ADDRESS).collectionManager.hasCollection(HasCollectionReq);
```

## Parameters
### HasCollectionReq
| Parameter       | Description     | Type   | Required |
| --------------- | --------------- | ------ | -------- |
| collection_name | Name of the collection to check | String | True     |

## Example
```javascript
new milvusClient(MILUVS_ADDRESS).collectionManager.hasCollection({
  collection_name: 'my_collection',
});
```

## Return
```javascript
// hasCollection return
{ status: { error_code: 'Success', reason: '' }, value: true }
```