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Showing content from https://cloud.google.com/cpp/docs/reference/bigtable/2.19.0/bigtable-auth-example below:

C++ Client Libraries | Google Cloud

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Override the authentication configuration

You can override this default using google::cloud::UnifiedCredentialsOption. The following example shows how to explicitly load a service account key file.

  namespace bigtable = ::google::cloud::bigtable;
  [](std::string const& project_id, std::string const& instance_id,
     std::string const& table_id, std::string const& keyfile) {
    auto is = std::ifstream(keyfile);
    is.exceptions(std::ios::badbit);
    auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
    auto options =
        google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
            google::cloud::MakeServiceAccountCredentials(contents));
    auto resource = bigtable::TableResource(project_id, instance_id, table_id);
    return bigtable::Table(bigtable::MakeDataConnection(options), resource);
  }

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.

Changing the default authentication configuration for other *Client classes is very similar, as shown in these examples:

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 numerous older versions available dating back to 2.11.0, each with its corresponding documentation."],["You can override the default authentication configuration using `google::cloud::UnifiedCredentialsOption`, which allows explicit loading of a service account key file, demonstrated in the provided example."],["Overriding authentication is similar for other `*Client` classes like `BigtableTableAdminClient` and `InstanceTableAdminClient`, and examples of this are available in the provided docs."],["The provided example is chosen for its simplicity, and the \"Best practices for managing service account keys\" guide should be consulted for more detailed information on managing service account keys."],["The \"Authentication Components\" section contains more details on the functions that create `google::cloud::Credentials` objects."]]],[]]

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