voluptasmollitia
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Monorepo for the Firebase JavaScript SDK
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[Home](./index.md) > [@firebase/auth](./auth.md) > [AdditionalUserInfo](./auth.additionaluserinfo.md) > [username](./auth.additionaluserinfo.username.md)
## AdditionalUserInfo.username property
The username if the provider is GitHub or Twitter.
<b>Signature:</b>
```typescript
readonly username?: string | null;
```