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set up adc for a local development environment authentication google cloud documentation skip to main content technology areas close ai and ml application development application hosting compute data analytics and pipelines databases distributed hybrid and multicloud industry solutions migration networking observability and monitoring security storage cross product tools close access and resources management costs and usage management infrastructure as code sdk languages frameworks and tools console english deutsch español español américa latina français indonesia italiano português português brasil עברית 中文 简体 中文 繁體 日本語 한국어 sign in google cloud sdk authentication start free overview guides reference resources technology areas more overview guides reference resources cross product tools more console discover google cloud sdk overview gcloud cli overview cloud client libraries overview client libraries and cloud apis explained get started install the gcloud cli other installation methods using docker overview migrate to the stable image using a snap package using versioned archives using the installer using homebrew authenticate to google cloud authentication methods at google ways to authenticate authenticate for using client libraries authenticate for using rest authenticate by using service account impersonation application default credentials set up application default credentials overview local development environment resource with an attached service account containerized environment on premises or another cloud provider cloud based development environment how application default credentials works troubleshoot your adc setup api keys use api keys to access apis manage api keys best practices for managing api keys get an id token tokens overview token types 2 step verification requirement reauthentication authentication use cases identity management products configure the gcloud cli initialize the gcloud cli authenticate for the gcloud cli configure the gcloud cli for use behind a proxy or firewall manage gcloud cli configurations manage gcloud cli properties enable accessibility features develop gcloud cli cheat sheet scripting gcloud cli commands client libraries best practices manage packages in gcloud cli managing gcloud cli components uninstalling the gcloud cli ai and ml application development application hosting compute data analytics and pipelines databases distributed hybrid and multicloud industry solutions migration networking observability and monitoring security storage access and resources management costs and usage management infrastructure as code sdk languages frameworks and tools home documentation application development google cloud sdk authentication guides send feedback set up adc for a local development environment stay organized with collections save and categorize content based on your preferences you can provide either your user credentials or service account credentials to adc in a local development environment user credentials when your code is running in a local development environment such as a development workstation the best option is to use the credentials associated with your user account how you configure adc with your user account depends on whether your user account is managed by google in other words it is a google account or by another identity provider idp and federated by using workforce identity federation google account to configure adc with a google account you use the google cloud cli install the google cloud cli if you re using an external identity provider idp you must first sign in to the gcloud cli with your federated identity if you re using a local shell then create local authentication credentials for your user account gcloud auth application default login you don t need to do this if you re using cloud shell if an authentication error is returned and you are using an external identity provider idp confirm that you have signed in to the gcloud cli with your federated identity note to add scopes for services outside of google cloud such as google drive create an oauth client id and provide it to the gcloud auth application default login command by using the client id file flag specifying your scopes with the scopes flag a sign in screen appears after you sign in your credentials are stored in the local credential file used by adc external idp to configure adc for a user account managed by an external idp and federated with workforce identity federation install the google cloud cli after installation initialize the google cloud cli by running the following command gcloud init if you re using an external identity provider idp you must first sign in to the gcloud cli with your federated identity if you re using a local shell then create local authentication credentials for your user account gcloud auth application default login you don t need to do this if you re using cloud shell if an authentication error is returned and you are using an external identity provider idp confirm that you have signed in to the gcloud cli with your federated identity a sign in screen appears after you sign in your credentials are stored in the local credential file used by adc tips for configuring adc with your user credentials when you configure adc with your user account you should be aware of the following facts adc configured with a user account might not work for some apis without extra configuration steps if you see an error message about the api not being enabled in the project or that there is no quota project available see user credentials not working the local adc file contains your refresh token any user with access to your file system can use it to get a valid access token if you no longer need these local credentials you can revoke them by using the gcloud auth application default revoke command your local adc file is associated with your user account not your gcloud cli configuration changing to a different gcloud cli configuration might change the identity used by the gcloud cli but it does not affect your local adc file or the adc configuration service account credentials you can configure adc with credentials from a service account by using service account impersonation or by using a service account key service account impersonation you can use service account impersonation to set up a local application default credentials adc file client libraries that support impersonation can use those credentials automatically local adc files created by using impersonation are supported in the following languages c c go java node js php python ruby rust you must have the service account token creator roles iam serviceaccounttokencreator iam role on the service account you are impersonating for more information see required roles use service account impersonation to create a local adc file gcloud auth application default login impersonate service account service_acct_email you can now use client libraries using the supported languages the same way you would after setting up a local adc file with user credentials credentials are automatically found by the authentication libraries for more information see authenticate for using client libraries credentials from a local adc file generated by using service account impersonation are not supported by all of the authentication libraries for more information see error returned for local credentials from service account impersonation service account keys if you cannot use a user account or service account impersonation for local development you can use a service account key note service account keys are a security risk if not managed correctly you should choose a more secure alternative to service account keys whenever possible if you must authenticate with a service account key you are responsible for the security of the private key and for other operations described by best practices for managing service account keys if you are prevented from creating a service account key service account key creation might be disabled for your organization for more information see managing secure by default organization resources if you acquired the service account key from an external source you must validate it before use for more information see security requirements for externally sourced credentials to create a service account key and make it available to adc create a service account with the roles your application needs and a key for that service account by following the instructions in creating a service account key set the environment variable google_application_credentials to the path of the json file that contains your credentials this variable applies only to your current shell session so if you open a new session set the variable again example linux or macos export google_application_credentials key_path replace key_path with the path of the json file that contains your credentials for example export google_application_credentials home user downloads service account file json example windows for powershell env google_application_credentials key_path replace key_path with the path of the json file that contains your credentials for example env google_application_credentials c users username downloads service account file json for command prompt set google_application_credentials key_path replace key_path with the path of the json file that contains your credentials note when you set the google_application_credentials environment variable adc checks this location first then checks other locations only if necessary what s next understand best practices for using service account keys learn more about how adc finds credentials authenticate for using cloud client libraries authenticate for using rest explore authentication methods send feedback except as otherwise noted the content of this page is licensed under the creative commons attribution 4 0 license and code samples are licensed 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