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C++ Client Libraries | Google Cloud

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Override the authentication configuration

Some applications cannot use the default authentication mechanism (known as Application Default Credentials). You can override this default using google::cloud::UnifiedCredentialsOption. The following example shows how to explicitly load a service account key file.

  namespace gcs = ::google::cloud::storage;
  [](std::string const& filename, std::string const& bucket_name,
     std::string const& object_name) {
    auto is = std::ifstream(filename);
    is.exceptions(std::ios::badbit);
    auto json_string =
        std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
    auto credentials =
        google::cloud::MakeServiceAccountCredentials(json_string);
    auto client = gcs::Client(
        google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
            credentials));
    PerformSomeOperations(client, bucket_name, object_name);
  }

Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the Best practices for managing service account keys guide for more details.

See Also

Authentication Components - for more information on the factory functions to create google::cloud::Credentials objects.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["The latest version available is 2.37.0-rc, with a history of versions back to 2.11.0 accessible via their respective links."],["The default authentication mechanism, known as Application Default Credentials, can be overridden using `google::cloud::UnifiedCredentialsOption`."],["An example demonstrates loading a service account key file to override the default authentication and set credentials in `google::cloud::Options`."],["Service account keys are used in the example, and it is recommended to consult the best practices guide for managing these keys."],["For more information on the factory functions to create `google::cloud::Credentials` objects, refer to the Authentication Components documentation."]]],[]]

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