[Home](./index.md) > [ibm-cloud-sdk-core](./ibm-cloud-sdk-core.md) > [BearerTokenAuthenticator](./ibm-cloud-sdk-core.bearertokenauthenticator.md) > [(constructor)](./ibm-cloud-sdk-core.bearertokenauthenticator._constructor_.md) ## BearerTokenAuthenticator.(constructor) Create a new BearerTokenAuthenticator instance. **Signature:** ```typescript constructor(options: Options); ``` ## Parameters

Parameter	Type	Description
options	Options	Configuration options for bearer authentication. This should be an object containing the "bearerToken" field.

## Exceptions Error: the options.bearerToken field is not valid, or unspecified