# Search Brand/User

The Collector function serves as a query tool that provides pivotal data about various DID entities and their associations.

Key features include:

* Retrieving a Brand DID and User DID collection with a specific condition
* Get the detailed information of a Brand DID or User DID.

Below are some examples:

```javascript
const { collector } = new CommunitiesID(options);
await collector.searchBrandDID('did')
await collector.searchUserDID('a.did')
```

Collector module also contains some methods to get specific collection of Brand / User DIDs. These methods are implements using OpenSea API, so if you want to use these methods on mainnet, OpenSea API key is required.

```javascript
await collector.getAllBrandDIDs(5)
await collector.getAllUserDIDsOwnedByBrand('did')
await collector.getAllUserDIDsOfOneWalletInOneBrand('0x123', 'did')
```

For more details, please refer to [API doc](https://docs.communities.id/developers/sdk/api-reference/collector).