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Showing content from https://cloud.google.com/cpp/docs/reference/language/2.31.0/language-override-authentication below:

C++ Client Libraries | Google Cloud

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• 2.42.0-rc (latest)
• 2.41.0
• 2.40.0
• 2.39.0
• 2.38.0
• 2.37.0
• 2.36.0
• 2.35.0
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• 2.32.0
• 2.31.0
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• 2.11.0

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::language_v1::LanguageServiceClient(
        google::cloud::language_v1::MakeLanguageServiceConnection(options));
  }

Follow these links to find examples for other *Client classes:

• language_v1::LanguageServiceClient
• language_v2::LanguageServiceClient

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.

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 in the Google Cloud C++ client libraries, specifically showing version 2.31.0 of the language library."],["The content demonstrates how to override the Application Default Credentials (ADC) by using the `UnifiedCredentialsOption` to load a service account key file."],["Examples are provided for `language_v1::LanguageServiceClient` and `language_v2::LanguageServiceClient` illustrating how to override authentication for these specific client classes."],["The documentation includes links to additional resources, such as best practices for managing service account keys and a section on authentication components for creating credentials objects."],["The latest release candidate is version 2.37.0-rc and a comprehensive list of releases from 2.37.0-rc down to 2.11.0 are provided in the release history."]]],[]]

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