[Home](./index.md) > [ibm-cloud-sdk-core](./ibm-cloud-sdk-core.md) > [BasicAuthenticator](./ibm-cloud-sdk-core.basicauthenticator.md) > [authenticate](./ibm-cloud-sdk-core.basicauthenticator.authenticate.md) ## BasicAuthenticator.authenticate() method Add basic authentication information to `requestOptions`. The basic authentication information will be set in the Authorization property of `requestOptions.headers` in the form: Authorization: Basic <encoded username and password> **Signature:** ```typescript authenticate(requestOptions: AuthenticateOptions): Promise; ``` ## Parameters

Parameter	Type	Description
requestOptions	AuthenticateOptions	The request to augment with authentication information.

**Returns:** Promise<void>