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::developerconnect_v1::DeveloperConnectClient(
google::cloud::developerconnect_v1::MakeDeveloperConnectConnection(
options));
}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThe client libraries default to using Application Default Credentials for authentication with Google Cloud Services, but this can be overridden if needed.\u003c/p\u003e\n"],["\u003cp\u003eAuthentication can be overridden by providing the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, as demonstrated in the provided example which loads a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eThe provided examples demonstrate a simplified form of authentication, but it's recommended to consult the "Best practices for managing service account keys" guide for more robust management.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation contains multiple versioned references for developer connect, ranging from version 2.27.0 to version 2.37.0-rc (latest).\u003c/p\u003e\n"],["\u003cp\u003eThe "Authentication Components" section provides further information on creating \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects and it should be consulted for factory functions.\u003c/p\u003e\n"]]],[],null,[]]
