[Home](./index.md) > [ibm-cloud-sdk-core](./ibm-cloud-sdk-core.md) > [getAuthenticatorFromEnvironment](./ibm-cloud-sdk-core.getauthenticatorfromenvironment.md) ## getAuthenticatorFromEnvironment() function Look for external configuration of authenticator. Try to get authenticator from external sources, with the following priority: 1. Credentials file (ibm-credentials.env) 2. Environment variables 3. VCAP Services (Cloud Foundry) **Signature:** ```typescript export declare function getAuthenticatorFromEnvironment(serviceName: string): Authenticator; ``` ## Parameters

Parameter	Type	Description
serviceName	string	the service name prefix.

**Returns:** [Authenticator](./ibm-cloud-sdk-core.authenticator.md)