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Showing content from https://cloud.google.com/cpp/docs/reference/oauth2/2.23.0 below:

C++ Client Libraries | Google Cloud

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This library contains helpers to create OAuth2 access tokens. This may be useful when trying to access customer services deployed to Cloud Run, or when using Google APIs that lack a client library in google-cloud-cpp.

The following shows the code that you'll run in the google/cloud/oauth2/quickstart/ directory. This is the typical usage of the library in applications.

#include "google/cloud/oauth2/access_token_generator.h"
#include <iostream>

int main(int argc, char* argv[]) try {
  if (argc != 1) {
    std::cerr << "Usage: " << argv[0] << "\n";
    return 1;
  }

  // Use Application Default Credentials to initialize an AccessTokenGenerator
  // retrieve the access token.
  auto credentials = google::cloud::MakeGoogleDefaultCredentials();
  auto generator =
      google::cloud::oauth2::MakeAccessTokenGenerator(*credentials);
  auto token = generator->GetToken();
  if (!token) throw std::move(token).status();
  // Only print the first few characters to avoid leaking tokens in test logs.
  std::cout << "The access token starts with " << token->token.substr(0, 16)
            << "\n";

  return 0;
} catch (google::cloud::Status const& status) {
  std::cerr << "google::cloud::Status thrown: " << status << "\n";
  return 1;
}

• oauth2::AccessTokenGenerator
• oauth2::MakeAccessTokenGenerator()

• Error Handling - describes how the library reports errors.
• Authentication methods at Google - has more information about authentication and the Application Default credentials

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 library provides tools for creating OAuth2 access tokens, which are useful for accessing Cloud Run services or Google APIs without a dedicated client library in `google-cloud-cpp`."],["The latest release candidate version of this OAuth2 library is 2.37.0-rc, and it also displays a list of versions ranging back to 2.16.0."],["The library uses Application Default Credentials to initialize an `AccessTokenGenerator` that retrieves access tokens."],["The primary interfaces for the library are `oauth2::AccessTokenGenerator` and `oauth2::MakeAccessTokenGenerator()`."],["The library reports errors using standard error handling and authentication methods as found on Google's documentation website."]]],[]]

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