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Use API keys to access APIs | Authentication

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This page describes how to use API keys to access Google Cloud APIs and services that accept API keys.

Not all Google Cloud APIs accept API keys to authorize usage. Review the documentation for the service or API that you want to use to determine whether it accepts API keys.

For information about creating and managing API keys, including restricting API keys, see Manage API keys.

For information about using API keys with Google Maps Platform, see the

. For more information about the API Keys API, see the

.

Select the tab for how you plan to use the samples on this page:

To use the .NET samples on this page in a local development environment, install and initialize the gcloud CLI, and then set up Application Default Credentials with your user credentials.

1. Install the Google Cloud CLI.

2. If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

3. If you're using a local shell, then create local authentication credentials for your user account:

   gcloud auth application-default login

   You don't need to do this if you're using Cloud Shell.

   If an authentication error is returned, and you are using an external identity provider (IdP), confirm that you have signed in to the gcloud CLI with your federated identity.

For more information, see Set up ADC for a local development environment in the Google Cloud authentication documentation.

To use the C++ samples on this page in a local development environment, install and initialize the gcloud CLI, and then set up Application Default Credentials with your user credentials.

1. Install the Google Cloud CLI.

2. If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

3. If you're using a local shell, then create local authentication credentials for your user account:

   gcloud auth application-default login

   You don't need to do this if you're using Cloud Shell.

   If an authentication error is returned, and you are using an external identity provider (IdP), confirm that you have signed in to the gcloud CLI with your federated identity.

For more information, see Set up ADC for a local development environment in the Google Cloud authentication documentation.

To use the Go samples on this page in a local development environment, install and initialize the gcloud CLI, and then set up Application Default Credentials with your user credentials.

1. Install the Google Cloud CLI.

2. If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

3. If you're using a local shell, then create local authentication credentials for your user account:

   gcloud auth application-default login

   You don't need to do this if you're using Cloud Shell.

   If an authentication error is returned, and you are using an external identity provider (IdP), confirm that you have signed in to the gcloud CLI with your federated identity.

For more information, see Set up ADC for a local development environment in the Google Cloud authentication documentation.

To use the Node.js samples on this page in a local development environment, install and initialize the gcloud CLI, and then set up Application Default Credentials with your user credentials.

1. Install the Google Cloud CLI.

2. If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

3. If you're using a local shell, then create local authentication credentials for your user account:

   gcloud auth application-default login

   You don't need to do this if you're using Cloud Shell.

   If an authentication error is returned, and you are using an external identity provider (IdP), confirm that you have signed in to the gcloud CLI with your federated identity.

For more information, see Set up ADC for a local development environment in the Google Cloud authentication documentation.

To use the Python samples on this page in a local development environment, install and initialize the gcloud CLI, and then set up Application Default Credentials with your user credentials.

1. Install the Google Cloud CLI.

2. If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

3. If you're using a local shell, then create local authentication credentials for your user account:

   gcloud auth application-default login

   You don't need to do this if you're using Cloud Shell.

   If an authentication error is returned, and you are using an external identity provider (IdP), confirm that you have signed in to the gcloud CLI with your federated identity.

For more information, see Set up ADC for a local development environment in the Google Cloud authentication documentation.

To use the REST API samples on this page in a local development environment, you use the credentials you provide to the gcloud CLI.

Install the Google Cloud CLI.

If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

For more information, see Authenticate for using REST in the Google Cloud authentication documentation.

To include an API key with a REST API call, use the x-goog-api-key HTTP header, as shown in the following example:

curl -X POST \
    -H "X-goog-api-key: API_KEY" \
    -H "Content-Type: application/json; charset=utf-8" \
    -d @request.json \
    "https://translation.googleapis.com/language/translate/v2"

If you can't use the HTTP header, you can use the key query parameter. However, this method includes your API key in the URL, exposing your key to theft through URL scans.

The following example shows how to use the key query parameter with a Cloud Natural Language API request for documents.analyzeEntities. Replace API_KEY with the key string of your API key.

POST https://language.googleapis.com/v1/documents:analyzeEntities?key=API_KEY

This example uses the Cloud Natural Language API, which accepts API keys, to demonstrate how you would provide an API key to the library.

When you use API keys in your applications, ensure that they are kept secure during both storage and transmission. Publicly exposing your API keys can lead to unexpected charges on your account. For more information, see Best practices for managing API keys.

• See an overview of authentication methods.
• Learn more about the API Keys API.

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 details the use of API keys for accessing Google Cloud APIs and services, noting that not all APIs accept them for authorization."],["To use API keys with REST API calls, you can include the key in the `x-goog-api-key` header or, less securely, as a `key` query parameter."],["The document provides instructions on installing and initializing the `gcloud` CLI, along with setting up Application Default Credentials (ADC) in a local development environment for various programming languages."],["API keys can also be utilized within client libraries by setting the API key option during client initialization, demonstrated with the Cloud Natural Language API in several programming languages."],["It's essential to securely store and transmit API keys to prevent unauthorized access and unexpected charges, as detailed in the \"Best practices for managing API keys\" documentation."]]],[]]

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