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Showing content from http://cloud.google.com/cpp/docs/reference/apikeys/2.28.0/apikeys-override-authentication below:

C++ Client Libraries | Google Cloud

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How to Override the Authentication Credentials

Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:

  [](std::string const& keyfile) {
    auto is = std::ifstream(keyfile);
    is.exceptions(std::ios::badbit);  // Minimal error handling in examples
    auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
    auto options =
        google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
            google::cloud::MakeServiceAccountCredentials(contents));
    return google::cloud::apikeys_v2::ApiKeysClient(
        google::cloud::apikeys_v2::MakeApiKeysConnection(options));
  }

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."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud C++ client libraries for API Keys."],["The latest version available is 2.37.0-rc, with a list of versions provided from 2.37.0-rc down to 2.11.0."],["Users can override the default credentials by using the `UnifiedCredentialsOption`, as demonstrated in the provided code example, which utilizes a service account key file."],["The provided documentation uses the API Keys client library as an example due to the simplicity of understanding the example."],["For more information about creating credentials objects, the documentation links to the Authentication Components documentation."]]],[]]


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